How many reps do you have to squat before they tell you you squat that much?

If you are looking for strength 3 sets of 6 -8 reps, for a toner look go for 10 -12 BUT with lighter weights. do 3 days a week.

I have been training heavily for a while, and would think logically that doing sqauts, wide squats and lunges for 15 mins would burn around 100 calories. I am able to do about 45 squats per minute,...

One obvious answer would be "as much as you can." This, of course, means that you should always be improving. squat with just the bar, and gradually add weight.

A lot, lunges work good too.

My son is 5'11" and weighs 210 pounds, he's 17 years old, been lifting 5 days a week for a year. He squats 600 lbs, benches 350 lbs and dead lifts 450 lbs.