Question
Where can I set up the Auto Save in Revit?
Answer
You can’t set an Auto Save in Revit, only set a reminder.
This can be done by clicking on the Applications Menu 
, then selecting Options (bottom left). Pm the General section – Notifications, you can set the Save reminder interval to 15 or 30 minutes, 1,2, 4 hours, and No reminder. You can also to this when you synchronize with central.