My iphone won't start back up! Why? How long will it take?

So I reset my iPhone settings it went good. But i wanted to erase everything basically erase and reset which i did but now its just loading with the circle thing in the middle with the black screen and it won't start back up even when i connect iot to my computer again.why? Does it take this long? How long does it take? How can i fix this?

Try to hold the power button and home button together. If it doesn't turn on it might be a battery problem.

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