How long will it take for a completely dead iPhone 5 to see screen?

I went on a white water rafting trip and I had an Otterbox case on my phone. Some water got into the case so I'm guessing it got into my iPhone 5. Once I got home, I immediately put it into rice so it can absorb the water out of the phone.

How long will it take after plugging in my iPhone 5 to a wall charger will I be able to see this screen?
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My iPhone is still sitting in the rice right now, I just wanted to know how long before I can see that screen. I heard some people say it takes 5-10 minutes.

Assuming there's no water damage a with a completely dead iphone battery it can take up to half an hour