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.
Set aside plenty of time. A perm can take anywhere from 2 to 4 hours to accomplish. After that, you'll have to let the perm set for 24 hours, which means no washing or styling your hair, and no pulling it back. Additionally, you won't be able to wash your hair until 48 hours after the perm.