diff --git a/grizzly/common/iomanager.py b/grizzly/common/iomanager.py
index af434cd5..34004d87 100644
--- a/grizzly/common/iomanager.py
+++ b/grizzly/common/iomanager.py
@@ -46,9 +46,9 @@ def commit(self):
         if len(self.tests) > self._report_size:
             self.tests.pop(0).cleanup()
 
-    def create_testcase(self, adapter_name, time_limit):
+    def create_testcase(self, adapter_name):
         assert self._test is None
-        self._test = TestCase(self.page_name(), adapter_name, time_limit=time_limit)
+        self._test = TestCase(self.page_name(), adapter_name)
         # reset redirect map
         self.server_map.set_redirect(
             "grz_current_test", self.page_name(), required=False
diff --git a/grizzly/common/storage.py b/grizzly/common/storage.py
index afd1e161..e4c0d2d4 100644
--- a/grizzly/common/storage.py
+++ b/grizzly/common/storage.py
@@ -46,7 +46,6 @@ class TestCase:
         "hang",
         "https",
         "input_fname",
-        "time_limit",
         "timestamp",
         "version",
         "_files",
@@ -60,7 +59,6 @@ def __init__(
         adapter_name,
         data_path=None,
         input_fname=None,
-        time_limit=None,
         timestamp=None,
     ):
         assert entry_point
@@ -73,7 +71,6 @@ def __init__(
         self.https = False
         self.input_fname = input_fname  # file that was used to create the test case
         self.entry_point = self.sanitize_path(entry_point)
-        self.time_limit = time_limit
         self.timestamp = time() if timestamp is None else timestamp
         self.version = __version__
         self._files = TestFileMap(optional={}, required={})
@@ -237,7 +234,6 @@ def clone(self):
             self.entry_point,
             self.adapter_name,
             input_fname=self.input_fname,
-            time_limit=self.time_limit,
             timestamp=self.timestamp,
         )
         result.assets = dict(self.assets)
@@ -307,17 +303,23 @@ def dump(self, dst_path, include_details=False):
         if include_details:
             assert isinstance(self.env_vars, dict)
             info = {
-                "adapter": self.adapter_name,
-                "duration": self.duration,
-                "env": self.env_vars,
-                "hang": self.hang,
                 "https": self.https,
-                "input": Path(self.input_fname).name if self.input_fname else None,
                 "target": self.entry_point,
-                "time_limit": self.time_limit,
-                "timestamp": self.timestamp,
-                "version": self.version,
             }
+            if self.adapter_name:
+                info["adapter"] = self.adapter_name
+            if self.duration:
+                info["duration"] = self.duration
+            if self.env_vars:
+                info["env"] = self.env_vars
+            if self.hang:
+                info["hang"] = self.hang
+            if self.input_fname:
+                info["input"] = Path(self.input_fname).name
+            if self.timestamp:
+                info["timestamp"] = self.timestamp
+            if self.version:
+                info["version"] = self.version
             # save target assets and update meta data
             if self.assets:
                 assert isinstance(self.assets, dict)
@@ -389,7 +391,6 @@ def load(cls, path, entry_point=None, catalog=False):
             info.get("adapter", None),
             data_path=entry_point.parent,
             input_fname=info.get("input", None),
-            time_limit=info.get("time_limit", None),
             timestamp=info.get("timestamp", 0),
         )
         test.assets = info.get("assets", {})
diff --git a/grizzly/common/test_iomanager.py b/grizzly/common/test_iomanager.py
index ce6479e8..2ce2e163 100644
--- a/grizzly/common/test_iomanager.py
+++ b/grizzly/common/test_iomanager.py
@@ -31,7 +31,7 @@ def test_iomanager_02(report_size, iters):
     with IOManager(report_size=report_size) as iom:
         assert not iom.tests
         for current in range(1, iters + 1):
-            tcase = iom.create_testcase("test-adapter", 10)
+            tcase = iom.create_testcase("test-adapter")
             assert iom._generated == current
             assert iom._test is not None
             precommit_size = len(iom.tests)
@@ -58,7 +58,6 @@ def test_iomanager_03():
 
 def test_iomanager_04():
     """test IOManager.create_testcase()"""
-    time_limit = 10
     with IOManager() as iom:
         assert iom._generated == 0
         assert iom._report_size == 1
@@ -66,10 +65,9 @@ def test_iomanager_04():
         assert not iom.server_map.dynamic
         assert not iom.server_map.include
         assert not iom.server_map.redirect
-        tcase = iom.create_testcase("test-adapter", time_limit)
+        tcase = iom.create_testcase("test-adapter")
         assert tcase is not None
         assert not any(tcase.optional)
-        assert tcase.time_limit == time_limit
         assert "grz_current_test" in iom.server_map.redirect
         assert iom.server_map.redirect["grz_current_test"].target == tcase.entry_point
         assert "grz_next_test" in iom.server_map.redirect
diff --git a/grizzly/common/test_storage.py b/grizzly/common/test_storage.py
index 1bff54b8..6416327d 100644
--- a/grizzly/common/test_storage.py
+++ b/grizzly/common/test_storage.py
@@ -368,7 +368,6 @@ def test_testcase_15(tmp_path):
         org.https = not org.https
         org.hang = not org.hang
         org.input_fname = "infile"
-        org.time_limit = 456
         org.add_from_bytes(b"a", org.entry_point)
         org.assets = {"sample": asset.name}
         org.assets_path = asset_path
@@ -406,7 +405,7 @@ def test_testcase_16():
 )
 def test_testcase_17(tmp_path, remote_assets):
     """test TestCase.clone()"""
-    with TestCase("test.htm", "adpt", input_fname="fn", time_limit=2) as src:
+    with TestCase("test.htm", "adpt", input_fname="fn") as src:
         if remote_assets:
             src.assets = {"foo": "asset.file"}
             src.assets_path = tmp_path
diff --git a/grizzly/common/test_utils.py b/grizzly/common/test_utils.py
index 112542e7..8b8011cd 100644
--- a/grizzly/common/test_utils.py
+++ b/grizzly/common/test_utils.py
@@ -66,9 +66,9 @@ def test_configure_logging_01(mocker, env, log_level):
         # use defaults instead of low test values
         (None, None, [1], (DEFAULT_TIME_LIMIT, DEFAULT_TIME_LIMIT + TIMEOUT_DELAY)),
         # use duration from test case
-        (None, None, [99.1], (100, 100 + TIMEOUT_DELAY)),
+        (None, None, [90.1], (100, 100 + TIMEOUT_DELAY)),
         # multiple tests
-        (None, None, [99.9, 10, 25], (100, 100 + TIMEOUT_DELAY)),
+        (None, None, [90.9, 10, 25], (100, 100 + TIMEOUT_DELAY)),
         # specify time limit
         (100, None, [0], (100, 100 + TIMEOUT_DELAY)),
         # specify timeout (> DEFAULT_TIME_LIMIT)
diff --git a/grizzly/common/utils.py b/grizzly/common/utils.py
index 042a9a60..dd4f1049 100644
--- a/grizzly/common/utils.py
+++ b/grizzly/common/utils.py
@@ -6,7 +6,6 @@
 from importlib.metadata import PackageNotFoundError, version
 from ipaddress import IPv4Address
 from logging import DEBUG, basicConfig, getLogger
-from math import ceil
 from os import getenv, getpid
 from pathlib import Path
 from shutil import rmtree
@@ -243,8 +242,8 @@ def time_limits(
         time_limit (int): Test time limit.
         timeout (int): Iteration timeout.
         tests (iterable): Testcases that may contain time limit values.
-        default_limit (int): Value to used as default time limit.
-        timeout_delay (int): Value to used as delay when calculating timeout.
+        default_limit (int): Value to use as default time limit.
+        timeout_delay (int): Value to use as delay when calculating timeout.
 
     Returns:
         tuple (int, int): Time limit and timeout.
@@ -257,7 +256,8 @@ def time_limits(
         # use default_limit as a minimum
         test_limits = [default_limit]
         if tests:
-            test_limits.extend(int(ceil(x.duration)) for x in tests if x.duration)
+            # add small time buffer to duration
+            test_limits.extend(int(x.duration) + 10 for x in tests if x.duration)
         time_limit = max(test_limits)
     assert time_limit > 0
     # calculate timeout
diff --git a/grizzly/reduce/test_strategies.py b/grizzly/reduce/test_strategies.py
index 8cd7514c..c6ba5d00 100644
--- a/grizzly/reduce/test_strategies.py
+++ b/grizzly/reduce/test_strategies.py
@@ -40,7 +40,7 @@ def update(self, success):
             pass
 
     # create testcase
-    with TestCase("a.htm", "adpt", input_fname="fn", time_limit=2) as test:
+    with TestCase("a.htm", "adpt", input_fname="fn") as test:
         test.duration = 1.2
         test.hang = is_hang
         test.add_from_bytes(b"123", test.entry_point)
diff --git a/grizzly/session.py b/grizzly/session.py
index 1e126548..1465321e 100644
--- a/grizzly/session.py
+++ b/grizzly/session.py
@@ -129,9 +129,9 @@ def display_status(self, log_limiter):
         elif log_limiter.ready(self.status.iteration, self.target.monitor.launches):
             LOG.info("I%04d-R%02d ", self.status.iteration, self.status.results.total)
 
-    def generate_testcase(self, time_limit):
+    def generate_testcase(self):
         LOG.debug("calling iomanager.create_testcase()")
-        test = self.iomanager.create_testcase(self.adapter.name, time_limit)
+        test = self.iomanager.create_testcase(self.adapter.name)
         LOG.debug("calling adapter.generate()")
         with self.status.measure("generate"):
             self.adapter.generate(test, self.iomanager.server_map)
@@ -204,7 +204,7 @@ def run(
                 # TODO: avoid running test case if runner.startup_failure is True
 
             # create and populate a test case
-            current_test = self.generate_testcase(time_limit)
+            current_test = self.generate_testcase()
             # display status
             self.display_status(log_limiter=log_limiter)
             # run test case