It can be kept from wash to wash, especially if you cover with a silk scarf or similar at night. There is a possibility of damage from keeping a braid too long without re-braiding. How long is too long depends on the hair. The same hair are exposed to the outside for a long time, thus damaged more.
Another draw back is that once you unbraid you'll have a tough time removing the shed hairs. That could give bigger more damaging tangles. You technically can wash with a braid, but again tangling will increase.
Another note, you can re-braid without combing or with minimal finger combing. I do this all the time.
I've combed 1-2 times a week for a couple of months, and I combed 2 times a day while. I've had no difference in growth.
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