I voted both weekly and every other week.
*If I'm wearing wet buns and applying gel to my edges and hair every other day, then I wash weekly w. conditioner and diluted shampoo on scalp to remove product buildup (my hair is very curly and almost refuses to lay down w.o. a good satin scarf and good gel).
*If I'm in any other style such as 2-strand twists, a braidout, or some other typically "dry" style like a perm rod set, I will wash as little as every 2 wks to monthly, depending on how the style is made, and how it is holding up when wash time comes around.
*Right now I'm in 2-strand twists w. extensions added (synthetic Afro Marley Hair), so I will be washing every other week so that I can cleanse my scalp and remove the buildup of oils and braid spray.
Oops I just saw the "form" questions:
100% Natural or long-term transitioning: 100% natural & 2 years post relaxer. Last relaxer was July 22, 2009.
Current Length: about 1.5 to 2" past BSL (havent measured but hair is past BSL when stretched n not completely straightened.
Method of washing: diluted shampoo (a 1/2 dollar-sized amount of shampoo to 8 oz. water in a color applicator bottle, squeezed and lathered over hair and scalp), (Roux Porosity Control or Herbal Hair Tea rinse if needed), deep cond., cheapie cond., oil rinse
How often: at least every other week unless in a long-term dry style that would be ruined if wet (i.e. braidout/rollerset).
Why: product buildup on hair and scalp, itchiness, moisture needed.