Unless you’re a really high-level athlete, you won’t go anywhere near those calories burned. A marathon runner spends about 10-15 calories per minute. You’re saying that you are active for 1h straight, without breaks, at an activity level that matches marathon runners?

The benefits of this game regarding fitness are undeniable but there is no way to burn that much in two hours playing it. You’re more realistically looking at 500 extra calories. 800 if you’re going crazy hard.