It usually takes 2-6 weeks for most people to transition.

I personally have a hard time getting through it, after 3-3.5 weeks I usually give in and low poo which then I have to start all over again; and again after 3 weeks I just cannot take it anymore. If I could manage to wear my hair up (causes too much breakage/damage in my dry, brittle hair) I would probably last longer. Although, this is not everyone's experience, most people transition easier. I just produce an excessive amount of sebum (aka hair oil), and usually need to wash my hair 2-3x/day. I'm going to try again starting August, this time I'm changing a few 'tactics'.

I wish you success on your transitioning to CG.
Wavy, dry, protein sensitive, coarse, highly overly porus, very low elasticity, medium-thick density, very prone to split ends
Avoids: Sulphates, Silicones, Protein, Mineral oil, Petroleum, Polyquaternium, Sodium/Magnesium, Heat
Mod-CG since June 2007