Confession: When my hair was relaxed I only washed a few times a month. I didn't have dandruff and what not. I didn't grease my scalp a lot. I didn't have a lot of issues. I started self-relaxing in high school. My hair wasn't down my back, but that's because I burnt the stank out of it every day with a Hot and Gold curling iron.
I just did a weave on this woman with healthy, relaxed bsl hair. I asked her how often she washed and she laughed. I said, Hey! When I was relaxed I only washed every couple of weeks. She said she washed it less than that. She also doesn't put grease and what not on her hair.
Basically, it gets washed when she goes to her stylist. Her hair didn't stink, but she did have dandruff. I don't know that more washing would or would not change that.
I think her washing habits are more about not having the now-how or patience to wash and detangle her own hair as opposed to a desire to grow it out.
p1