How to put an auto shutdown timer for e71 radio?

Use the Profile Scheduler which can be found by using the search box on the left to find "Must have e71 softwares".

Go Options>New Schedule> Profile: Offline> Set on time (the time you want your radio to be turned off.

In offline mode, the radio cannot be used hence when you configure profile scheduler to switch to offline mode when the time is up, your radio will be turned off automatically.