If you're training for health and fat loss, there's no time that it should take. You only need to be concerned with pushing yourself as hard as you need to be for the kind of benifits you're looking for. For fat burning, you need to be working aerobically so you want to stay around or just below the point where it becomes a little difficult to talk to someone (or approx 55-70% of your max heart rate)
I'm not quite able to run 3 miles...but when I jog on the treadmill I travel at a very slow speed. I would say for a slow jog try for between 10-12 minute miles, and for a swift jog try between 7-9 minute miles.
I'm not an expert, so perhaps someone with more running experience can help you as I may be way off...but this is just my personal opinion.
I think alot depends on the length of your legs, too. I'm about 5'4", but have the legs of about a 5'2" or 5'3" person because I have a long torso. I run 4 miles in about 45 minutes, give or take....depending on my speed.
I think alot depends on the length of your legs, too. I'm about 5'4", but have the legs of about a 5'2" or 5'3" person because I have a long torso. I run 4 miles in about 45 minutes, give or take....depending on my speed.
How many minutes for a 3-5 mile jog? 
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