I dont think you have to do pts in certain amount of time. I think you should just do it when your hair seems to be asking for one. I did a pt once because I felt it was time and my hair became like straw because it didnt need it. Now Ive learned to keep my balance better I gave away my pts. I find ro's with protein are enough for my hair.
Low porosity, high density, and fine
4a/3c, mod-CG, itchy prone scalp
Natural 4 Life