How many calories in 1500 steps?

OK. Im 22, 153lbs and can run a mile full on in 7:34mins, but lets say i do it in ten. My calculations and research showed that with my weight, height, and age, i would burn 106 calories every ten mins. 60 mins to an hour, roughly 600 calories an hour. I would have to run for 2 hours and 23 mins to burn 1500 calories. ouch.............