I never chop now untill Im sure its Male..I made too many mistakes onthat....Will say it will be a few days to a week in flower (unless Auto) to open viable sacks....when I see what I think is a Male I will place it in flower room for a few days to be sure..if it is male..its chooped....If you spot a male in Veg and let him go chances are he wont shoot viable pollen....if it is a male..isolate him in another grow area as to not cross pollenate...the longer the male is in vegging the more chances his sacks will be viable..Hope this helps