Today there are many different bounty projects. Time for projects is also different. According to you, how many time the most appropriate for a bounty project?
There's nothing anything as average time in any project or ICO bounties. It depends on the project and what they are promising. If the project is not fulfilling there promises, then there's nothing you can do much about it. You just wait for your bounties to be paid. Bounty period can go anywhere from couple of months to 6 months.