As much as you take in....Or if you are over weight..Well then....More than you take in
Depends on what you want...To lose.....gain.....or stay the way that you are
Let me put it too you this way. You are NOT going to burn an unsafe amount of calories trying to lose 20 pounds in four months using Dance Revolution. Although, depending on your eating habits, it may FEEL like you have to burn an unsafe amount to get rid of excess calories.
Also, as just about any calorie burning counter on a fitness device, it is not accurate due to amount of variables involved. It is, however, a good way to judge the relative intensity of a work out.
Creamsicle is right about finding out your base metabolic rate and using it as a guide for calories burnt versus eaten. It really is a good way to keep up with things.
It takes 3500 calories to gain or lose a pound... doesn't really matter how much you burn off during exercise if you end up eating all of those calories or more back- if you eat more than you burn, you'll gain regardless of exercise.
Generally speaking a person shouldn't eat less than 1200 calories a day. Find out how many your body needs to maintain it's current weight, then burn off as many calories that will bring you down to 1200.
You can do a search online for sites that'll give you a generic calculation of how many calories you need to maintain your current weight by entering your age, sex, height and weight.
(of course, the assumption is that you only eat what that calculates for you, if you eat more - you'll have to exercise off that many more calories to get down to 1200)
There's no safe limit re: burning calories, but out of respect for your body you should start out easy and build up gradually. Your joints and muscles will thank you for it.
well i sued to burn about 1100-1200 a day at the gym on the cross training maching and i used to lose about 3 pounds a week along with healthy eating, that was 3 times a week (simply because i used to get tired and board to carry on doing it any more and though i needed to implement weights) though i did go gym more however. But answering your question i don't think you should be doing any more than around 1500 in day otherwise you'l just be working your body way to hard and it needs to recover for everything to run smoothly, you'l get there don't worry just stick to it! :)