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Mostly because they are so big, but when you get bigger stars like Hyper-giants and Super-giants, they will burn less as long as our sun. To give a comparison a Hyper-giant will burn for only a few million years, while our sun will burn for billions. An experiment you can try is fill a can full of lighter fluid or gasoline ( be careful because the gas will boil and release toxic fumes) and see how long it takes to burn, once it is done imagine a billion times that.