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.
It is also more damaging to the hair. The thio-free perm has less of an odor, and causes less damage. It also produces a looser wave, and does not last as long as a traditional perm. The digital perm lasts 3-6 months, and can recondition the hair, making it smoother after treatment. It produces a looser wave than the tight curls of a traditional perm. This perm can also damage hair, but is not as immediately damaging as a traditional one. Perms can take up to 3 hours to be completed, but the result creates long-lasting waves that are even visible when the hair is wet.