How long does it take for an iphone battery to die when powered off?

The top button on my iPhone is broken, and I have been using touch assist to lock it, ect, however, I accidentally turned it off and can't turn it back on (in the past when it has died, when you plug it in it automatically powers on) so I need for it to die! Lol I brought it to the apple store and there's nothing they can do to fix it, and they are out of iPhone 5's right now so I couldn't replace it, and I hate being phoneless!

It doesn't die. Your hopeless now. I don't know a trick to power on with a home button. So peace and good luk

Takes a while to die