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.
1 Although new hair growth will be a factor after a couple of months, perms can last for up to six months with gentle care and treatment.  To make a perm last longer, avoid heat styling as much as possible. Use a hair-dryer diffuser to help retain the curl of the perm and soften the damage of heat styling.