Updated unit timing.

Author: Rob-Barefoot

learn-pr/wwl-azure/guided-project-update-maintain-resources/4-exercise-manage-virtual-machines.yml

@@ -10,6 +10,6 @@ metadata:
   author: wwlpublish
   ms.author: robbarefoot
   ms.topic: unit
-durationInMinutes: 3
+durationInMinutes: 10
 content: |
-  [!include[](includes/4-exercise-manage-virtual-machines.md)]
+  [!include[](includes/4-exercise-manage-virtual-machines.md)]