Most bounty hunters immediately dump the coins they get since they treat it as payment for work that they've done.
As for me, I wait for a few days and see how active the team is after the ICO ends. If the team achieves what they have stated in their road map, I HODL for a long time.
But if delays happen, most of the time I dump them immediately.
If you closely follow the project during the bounty campaign, then long before its end it is clear whether to hold tokens for a long time. However, I prefer to go to the end and wait for the project to be fully realized. I do not sell tokens that I receive from bounty campaigns.
If you're fine with it go and sell your tokens if not,hold. The decision of yours will follow. No one will ever decide for you since you belong in community. For instance, I also have tokens and what I do with it is I save or hold it but if I really need some money,I have no choice but to sell it. As long as I'm gonna spend it to a very important reason.