Here are some tips to help you keep your temperatures manageable. 1  Do not let your grow room exceed 86Â° F. Keep it between 70Â°-86Â° (21Â°-30Â° C) 2  Heat rises. So place air intake vents as low as possible in the room and exhaust vents as high as possible. 3  Circulate the air in your grow room to keep temperatures even.
Quick Answer. Perms can take between 1 and 2 hours, depending on how long the hair being permed is and what perming technique is implemented by the stylist. Once complete, a perm is not completely settled until about 28 hours have passed. Keep Learning.
Perms take one to two hours, depending on how long your hair is and how fast your stylist is. Also keep in mind, a perm takes 28 hours to relax. Give it some time before you get too worried about the end result. Most perms generally last about 6 months. Unlike some hair color, a perm won't wash out, it has to grow out.