I always wondered what they were checking actually and why they have to do it "manually". I understand that when you make something automatic, at the beginning you check manually to see if there is no bug, but after a while you should be confident.
Since I do not know what they are checking, I do not know how long it takes, but for ready-goes and CC tourneys, you receive the credits immediatly as the tourney ends (I never checked precisely the delay but that's very very fast).
Regards