Board Thread:Troubleshooting/@comment-34457989-20180110083620/@comment-24.145.242.26-20180110201757

If you have it running before you go back, it will expire as soon as you open the game in the past.

If you activate it while in the past, it will work as long as your device day stays within the next 10 days of when you activated it. Go forward past that, it expires.