Okay, I was under the impression, that the most you could possibly 'stock up' on (without upgrading how many you can hold and what not) is like 9 stones worth the time, get 3, go check those in, go back and get 3 more, then wait for 3 more to be ready for you from the guy who gives them to you.
But, 2 days ago, me and a friend did a 6 stone Abbysea PT, then the next day (yesterday) he did yet another, now he has stones again.
So am I missing something here? Do the stones just keep building up with the guy indefinately, like if you wait 400 hours you'll have a total of 20 stones you can draw from constantly? Or is the guy just glitching?