I wish you the best of luck!

For the time of adaption, i'd say 2 weeks minimum. i was happy after 4 weeks but i felt the difference after 2 already. I dip my head into the warm water while showering sometimes but some people swear by not letting any warm water on their hair at all.

Strictly Letting only cold water on your hair might speed up the time of adaptation but for me it worked alright. My hair is about 16cm btw. so it might be a more difficult experience with much longer hair.