diff --git a/src/UserManager.ts b/src/UserManager.ts
index 9512a6de2..7ebee4ee0 100644
--- a/src/UserManager.ts
+++ b/src/UserManager.ts
@@ -229,7 +229,7 @@ export class UserManager extends OidcClient {
 
         const user = await this._signin(args, this._iframeNavigator, {
             startUrl: url,
-            silentRequestTimeout: this.settings.silentRequestTimeout
+            silentRequestTimeoutInSeconds: this.settings.silentRequestTimeoutInSeconds
         });
         if (user) {
             if (user.profile && user.profile.sub) {
@@ -294,7 +294,7 @@ export class UserManager extends OidcClient {
         };
         const navResponse = await this._signinStart(args, this._iframeNavigator, {
             startUrl: url,
-            silentRequestTimeout: this.settings.silentRequestTimeout
+            silentRequestTimeoutInSeconds: this.settings.silentRequestTimeoutInSeconds
         });
         try {
             const signinResponse = await this.processSigninResponse(navResponse.url);
diff --git a/src/UserManagerSettings.ts b/src/UserManagerSettings.ts
index 2a3154b2d..c50fb7819 100644
--- a/src/UserManagerSettings.ts
+++ b/src/UserManagerSettings.ts
@@ -21,8 +21,8 @@ export interface UserManagerSettings extends OidcClientSettings {
 
     /** The URL for the page containing the code handling the silent renew */
     silent_redirect_uri?: string;
-    /** Number of milliseconds to wait for the silent renew to return before assuming it has failed or timed out (default: 10000) */
-    silentRequestTimeout?: number;
+    /** Number of seconds to wait for the silent renew to return before assuming it has failed or timed out (default: 10) */
+    silentRequestTimeoutInSeconds?: number;
     /** Flag to indicate if there should be an automatic attempt to renew the access token prior to its expiration (default: false) */
     automaticSilentRenew?: boolean;
     validateSubOnSilentRenew?: boolean;
@@ -53,7 +53,7 @@ export class UserManagerSettingsStore extends OidcClientSettingsStore {
     public readonly popupWindowTarget: string | undefined;
 
     public readonly silent_redirect_uri: string | undefined;
-    public readonly silentRequestTimeout: number | undefined;
+    public readonly silentRequestTimeoutInSeconds: number | undefined;
     public readonly automaticSilentRenew: boolean;
     public readonly validateSubOnSilentRenew: boolean;
     public readonly includeIdTokenInSilentRenew: boolean;
@@ -76,7 +76,7 @@ export class UserManagerSettingsStore extends OidcClientSettingsStore {
             popupWindowFeatures,
             popupWindowTarget,
             silent_redirect_uri,
-            silentRequestTimeout,
+            silentRequestTimeoutInSeconds,
             automaticSilentRenew = false,
             validateSubOnSilentRenew = false,
             includeIdTokenInSilentRenew = true,
@@ -98,7 +98,7 @@ export class UserManagerSettingsStore extends OidcClientSettingsStore {
         this.popupWindowTarget = popupWindowTarget;
 
         this.silent_redirect_uri = silent_redirect_uri;
-        this.silentRequestTimeout = silentRequestTimeout;
+        this.silentRequestTimeoutInSeconds = silentRequestTimeoutInSeconds;
         this.automaticSilentRenew = automaticSilentRenew;
         this.validateSubOnSilentRenew = validateSubOnSilentRenew;
         this.includeIdTokenInSilentRenew = includeIdTokenInSilentRenew;
diff --git a/src/navigators/IFrameWindow.ts b/src/navigators/IFrameWindow.ts
index 296becf3a..67dcb8a00 100644
--- a/src/navigators/IFrameWindow.ts
+++ b/src/navigators/IFrameWindow.ts
@@ -4,7 +4,7 @@
 import { Log } from "../utils";
 import { IWindow, NavigatorParams } from "./IWindow";
 
-const DefaultTimeout = 10000;
+const DefaultTimeoutInSeconds = 10;
 
 export class IFrameWindow implements IWindow {
     private _promise: Promise<unknown>;
@@ -44,9 +44,9 @@ export class IFrameWindow implements IWindow {
             this._error("No _frame, already closed");
         }
         else {
-            const timeout = params.silentRequestTimeout || DefaultTimeout;
-            Log.debug("IFrameWindow.navigate: Using timeout of:", timeout);
-            this._timer = window.setTimeout(this._timeout.bind(this), timeout);
+            const timeoutInSeconds = params.silentRequestTimeoutInSeconds || DefaultTimeoutInSeconds;
+            Log.debug("IFrameWindow.navigate: Using timeout of:", timeoutInSeconds);
+            this._timer = window.setTimeout(this._timeout.bind(this), timeoutInSeconds * 1000);
             this._frame.src = params.url;
         }
 
diff --git a/src/navigators/IWindow.ts b/src/navigators/IWindow.ts
index d3b83f028..1b97a7ba3 100644
--- a/src/navigators/IWindow.ts
+++ b/src/navigators/IWindow.ts
@@ -7,7 +7,7 @@ export interface NavigatorParams {
     startUrl?: string;
     popupWindowFeatures?: string;
     popupWindowTarget?: string;
-    silentRequestTimeout?: number;
+    silentRequestTimeoutInSeconds?: number;
     redirectMethod?: "replace" | "assign";
 }
 
diff --git a/test/unit/UserManager.test.ts b/test/unit/UserManager.test.ts
index 86c5689ec..a83bac493 100644
--- a/test/unit/UserManager.test.ts
+++ b/test/unit/UserManager.test.ts
@@ -75,7 +75,7 @@ describe("UserManager", () => {
 
             settings = {
                 ...settings,
-                silentRequestTimeout: 123,
+                silentRequestTimeoutInSeconds: 123,
                 silent_redirect_uri: "http://client/silent_callback"
             };
             subject = new UserManager(settings);
@@ -92,7 +92,7 @@ describe("UserManager", () => {
             await subject.signinSilent();
 
             // assert
-            expect(navArgs.silentRequestTimeout).toEqual(123);
+            expect(navArgs.silentRequestTimeoutInSeconds).toEqual(123);
         });
 
         it("should work when having no User present", async () => {
diff --git a/test/unit/UserManagerSettings.test.ts b/test/unit/UserManagerSettings.test.ts
index 43c4c5b5e..bb64768cf 100644
--- a/test/unit/UserManagerSettings.test.ts
+++ b/test/unit/UserManagerSettings.test.ts
@@ -104,11 +104,11 @@ describe("UserManagerSettings", () => {
                 authority: "authority",
                 client_id: "client",
                 redirect_uri: "redirect",
-                silentRequestTimeout: 123
+                silentRequestTimeoutInSeconds: 123
             });
 
             // assert
-            expect(subject.silentRequestTimeout).toEqual(123);
+            expect(subject.silentRequestTimeoutInSeconds).toEqual(123);
         });
 
     });