How many miles a day should you run to lose fat from ones derrire?

It's not necessarily the miles that count ... it's the time in lots of cases. Some reports say to exercise at least 45 minutes.

Actually.... to lose a few pounds when running is to run at a good pace for 35 minutes and walk fast for 5 minutes to cool off. When you run 45 minutes or more you are no longer burning fat, you are increasing your cardio.