Q: When your muscles recover from weight training do u burn fat?Also,how many time does it take for muscles to recover?

A: Yes, the biggest fat-burning benefit of weight-training comes during the recovery time. This is what makes whole-body weight training a superior fat-burner compared to cardio. As far as how long the recovery takes, it'll vary quite a bit depending on the person, diet, training volume and intensity, etc. There's some evidence that suggests that recovery may continue for WEEKS (!) after the workout.

If you're looking for a quick rule of thumb, I'd say to allow 1 day of recovery for every 2 heavy to-failure sets for that muscle. So, for example, if you have a good back workout on Monday with 10 heavy to-failure sets, then wait 10 / 2 = 5 days, or till Saturday to work the back again.