There are many factors that go into how many calories you burn while training, including the type of training you are doing, the intensity, and you current weight.
That all depends on the type of training you do and how frequently you do it. Cardio intense workouts can burn as many as 5000 calories in a single day!
It depends on the exercise. The more of your body you use, the more you burn. Running might burn 500 calories an hour, whereas swimming can burn over 700.