It could take as little as a day, I've even had hairs pop out at the very end of veg. Your males need to be removed ASAP, unless you want all your plants energy to go into producing seeds instead of expending that energy towards making sticky buds full of Trichomes...the only plants you want to keep are 100% females. The Hermies will still pollinate your garden and fuck shit up! Toss one and two before it's too late bro...