Another dumb question! Remove from collection if watched?

[masterfork]

Hello! If a TV show has been marked for deletion and is added to a collection for "leaving soon"... If someone starts watching that show after it has been added to the leaving soon collection, how can it be automatically removed from that collection? My rule for removal is very simple in that if someone doesn't watch something in 700 days, it is flagged for removal.

Thanks!

Edit: seems I didn't wait long enough! It was removed automatically. I ran the "rules" again and it didn't seem to work, but after I left it alone for a little while longer, it automatically was removed.