Bounty award is distributed according to the rules posted on the bounty usually two weeks to one month. Just keep updating yourself with the ann thread or the bounty thread every week, and don't ask too much because of its irritating to the campaign manager.
Those are minimum periods that we do usually seen into a bounty but as you said most of the time given is always posted on the OP which will give the idea for its participants on when they would recieve their tokens.There are always an instance where they do recieve on delays due to some problems and might even take up for how many months and this is not really a good practice for me.