Washing and conditioning your hair should still be a part of your regimen. Many women try to extend their wash day because they do not want their natural hair to start showing from their scalp. At the most, you can go two to three weeks without washing your hair, but anything longer is a no-no. You have to wash your hair from all of the dirt, dandruff, and product build-up.
Consider using products with apple cider vinegar as a key ingredient, since it is known to thoroughly cleanse the hair and get rid of build-up, such as Madam C.J Walker Clarifying Shampoo with Cider Vinegar ($24) or Fekkai Apple Cider Shampoo ($20).
Just remember that the longer your braids, the heavier they will be when wet. It is best to wring them out when you get out of the shower and let them air-dry before going to bed, or else you will end up with a mildew smell that is not cute.