Ladies, how long does it take to deliver a baby?

Genuine question because I've never watched a birth and never asked this question to anyone before. I know that some labors can take long hours but I'm not asking about the moment you enter the hospital and delivered the baby I'm asking about the moment you enter the delivery room and start pushing. How long does that take is it fairly quick or can take like half an hour or more?

Ladies, how long does it take to deliver a baby?
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