How long will iOS 7 take to download?

Ok, so I'm super excited for ios 7 to come out on the 18th and i know that it will come out around 10 am, but i was wondering since i would be at school how long would it take to download if i was on 3G network I have a iPhone 4 so I don't have 4G. I just want a range in time no need to be specific.

It may take 10-15 min if speed is 10 Mbps

I believe it will take between 45 - 60 minutes. Be warned the download size is large when upgrading to IOS 7.

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