diff --git a/src/ProjectProject/PpEvent.class.st b/src/ProjectProject/PpEvent.class.st
index 6bb080c..503ea0b 100644
--- a/src/ProjectProject/PpEvent.class.st
+++ b/src/ProjectProject/PpEvent.class.st
@@ -95,6 +95,12 @@ PpEvent >> date: aDate [
 		endDate: aDate
 ]
 
+{ #category : #accessing }
+PpEvent >> duration [
+
+	^ self end - self start
+]
+
 { #category : #accessing }
 PpEvent >> end [