I do protective styling and used to co-wash my hair every two weeks, but never noticed any growth.
I did this because I would get product build up or my hair wouldn't get moisture. Also I didn't have time to take a day or two off just to do my hair.
It took me a while to finally realize why this kept happening and I decided to go a month without wash my hair and I did notice some improvement. I'm just wondering if its a bad thing and with me not washing my hair for a month I noticed I had product build up and such but it was the amount I get in 2 weeks time.