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.
How long after a perm can you wash your hair? A person should wait 24 to 48 hours after receiving a permanent hair treatment before washing her hair. If water is applied sooner than 24 hours after the perm, the chemicals can neutralize, and the hair can lose the curl. To achieve the best results, wait 48 hours.