Shadow boxing?

hey how much calorie can you burn by shadow boxing, for like 45 minutes|||depends, do you box...or would you just shadow for burning calories? if you box and use it as a full on work out..a heck of a lot, i cant give you a number i can tell you if you put in your all, an give it the ol%26#039; one two punch....you work up a sweat! pfoosh, im tired :)