I urge you to always search through the forum before posting certain questions, because this has been answered alot of times,
Regardless.

How much time do you spend on bounty campaigns?
You can spend as much as 18 hours daily on bounties depending on the number of bounties, you participate in and depending on the task as well, Moreover, the time does not matter; what matters is , Invest your time in profitable bounties

Is it worth doing bounty campaigns?
Yes, bounties are worth it, if you dedicate your time and efforts to it.


How much can you make from one bounty campaigns?
close to 2000$ depending on no of bounties at a time.