Noob Flowering Question?!?!?

indoor grow, Big Blue (Northern Lights #5 X Blueberry)
This is my first grow. I vegged em for 8 weeks. They have been in the 12/12 flowering stage for only 4 days now and I strongly beleive that I can distinguish the males from the females. Is this possible???
Also, just out of curiosity, how long could the males be in there with the females before they get em pregnant???
Thanks in advance guys, gals, and pals

hey,
well if u veged for 8 weeks then yes they could show sex faster like in 4 days..

as soon as i peg a male i get it out. and yeah its possible for them to show sex quick. as for how long before they pollinate i dunno. i figure no less than 3 days. but i cull em when i find em. unless there are reasons to keep them