About 30 minutes, and I experienced the infamous 'ring of fire.' I had no idea such a burning, terrifying pain existed until I gave birth (I did it naturally, while hooked up to pitocin no less!)
The baby kept crowning, but the pain was so intense that I couldn't get him all the way out. I just remember everyone yelling at me, lol. I finally started 'wrapping myself around my baby' (whatever the heck that means) and I pushed him out after that.
Made me wish I took my pre natal classes more seriously!