Endothermic atmosphere is prepared by reacting a mixture of hydrocarbon gas, typically methane or. propane and air, metered in a proportion such that there is just enough oxygen to form carbon monoxide. and hydrogen without excess carbon dioxide or water vapor.
But for your everyday run-of-the-mill deep conditioner, it should begin to work instantly, and reach maximum capacity at around the 20 or 30 minute mark. If your deep conditioner doesn't work after 30 minutes, it's time to ditch it for one that's more effective.
I rinsed my hair in the shower and applied this leave-in conditioner that my stylist recommended at least three times in between my perm and my shampoo. So, yes, you can get your hair wet in the first 24 hours and it won't ruin the perm, but I would advise against using conditioner.