Easy!!!
You can't count time with ex JWs but you can with worldlies.
This all adds to the 'time spent' which you can use to guarantee your eternal life in Jehooblah's New World.
To be honest, life is tooooooo short to spend with JWs. I'm desperately trying to get out of seeing some JW relatives next week..........the thought of them makes me nauseous.......but that in itself makes me laugh!
Mum! You make me Sick! Literally!!!!