If you are going for chemotherapy how long does it take before your hair has fallen out?

It varies by person and the kind of drug used. I received a drug that was supposed to make me bald in two weeks. Instead, I lost my eyebrows, all hair below my waist, and most of my eyelashes. My head hair thinned out a lot too and became very dry and brittle but I never completely lost my hair. I did end up shaving it though because it became hard to manage and really frustrating to deal with (and lose, even if it was slowly). (AVBD therapy)