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.
If one only seeks to maintain a particular hairstyle, the recommended time between perming treatments is six to eight weeks. Even for hairstyle maintenance, it is generally advised that the hair should be cared for with deep moisturizing treatments for several weeks before the perm treatment. Immediately before each perm treatment, it is advisable to take a hair strand test to see if the hair is ready for another perm.