Only comb to detangle during washing with a shower comb. That's about 2 to 3 times a week. Because I wear my hair natural and it's texture, the less combing the better.
I comb my hair almost everyday. I'm a smooth hair addict and it bugs me if a hair is not in place. I do detangle in the shower with condish. The further along in my stretch I get, I comb less. I'll just detangle the relaxed ends and put my hair back up in a bun and tied it down until the next time I wash/cowash.
I only comb on wash day... I've retained lot of length in the 10 months I've been on HLCF by doing that... I went from SL to BSL in 8 months and I am 100% low manipulation was really the key solution for me