We can setup TimeSheet to track only the time without having to selection Activities by denying them the Permission.
 
–  Identify the permission assigned to the user from Edit User screen.
–  Click on Administration Icon at the top to select Permission under User/Department from the left Pane.
–  Click the Permission to edit.
–  Expand TimeSheet to uncheck 'Show Activities in TimeSheet' and Select 'Activity Selection is not required' from the drop down list.
–  Click 'Save' to apply changes.
 
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