Basically what the title says. How often do you need to train your ass with toys in order to keep things nice and stretched out in preparation for semi regular anal play?

After awhile with no activity things go back to being pretty tight, which necessitates preparing for anal play essentially from square 1. This can be time consuming and a bit frustrating if you're just in the mood to get filled by something larger but aren't quite ready.

So how often should one train their ass with dildos, plugs, etc in order to maintain enough looseness to easily take a decent sized toy at a moment's notice? Every day? A few times a week? Once a week?