You know that's a good question... But there is no exact time needed in order for are campaign success...  Joining in bounty campaign is really good...  You will develop here skills in proper managing of time, it develops also you patience and ability to cope up easily in changes... Joining also in bounty campaign will help us to develop much of our skills...  Especially in proper maming of decision even it takes a lots of time but if we enjoy it it will lead us to succees...  Proper budgeting of time is hardly needed in joining campaign....