Yarn braids took me 15 hours and yarn twists took me 9. I have pictures of the braids in my fotki, but I will post pics of the twists if you want to see.
Actually, washing doesn't bother the braids, because they don't get frizzy. The parts will look different, but not the yarn. A lot of people (myself included) like them better after washing, because they look more like real locs/dreads. The only thing is that they take forever to dry.
Yes, I've been thinking about that more and more. I did my yarn twists on Saturday/Sunday, just finished my sister's and I have to do my mom's later on.
4, fine, low-medium density, low porosity
"When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps." - Confucius