You measure my life in hours and I serve you by expiring

You measure my life in hours and I serve you by expiring

You measure my life in hours and I serve you by expiring

Solve me this:

You measure my life in hours and I serve you by expiring riddle

You measure my life in hours and I serve you by expiring.

I’m quick when I’m thin and slow when I’m fat.

The wind is my enemy. 

What Am I?

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ANSWER

A candle.