i have noticed a certain portion of the day is unprofitable compared the the rest, say 6-10pm. how much data do i have to collect before i start to stop advertising during this period? im doing a low payout offer, how many conversions do i need?
Just make separate campaign and setup day parting on data you have right now.
Leave 2 campaigns running and adjust day parted campaign in next few weeks. Everyone will advice you to gather as much data s you can but it always depends on advertising budget.