mmmmm this sounds feral but i only was mine about 1x a month, unless i've been swimming. I used to wash it 1x wk in my teens (i have really thick hair and it takes hours to dry!) and i have just gradually let times betwee washing increase. I actually always get complimented in my hair ( i am really lucky it is so thick and naturally straight at the front and wavy at the back) even though i don't brush it and hardly wash it! i just run my fingers through it to detangle. i am too unco to use straighteners / blowdry which takes hours. i like not dousing my head in shampoo!!