I helped replace an awning fabric about 4 yrs ago. As I recall, it was about 11 turns. The voice of experience says make sure to wind the tension in the correct direction. I think the direction is labeled on the end caps.
If the awning is rolled up now, as far as I know, unrolling it will put tension on it.
Mike and JoAnne
Montana Summer / Arizona Winter
2016 Prism 24G /2002 HitchHiker 38LKTG
ACME EZTowing a 2015 Chevy Sonic RS Hatchback