How much room does ios 7 take up?

I just bought an iphone 4 (8gb). I used to have one a long time ago and then switched to an Android for a long while. Today I figured I would be happy with the iphone 4 again. My new iphone has ios 5.1.1 installed. It keeps saying I must update my phone to ios 6 or newer in order to use pretty much all the apps I want to download. From what I have found, I MUST install the new ios 7 which I'm not happy about. >. Is this true? I want to make damn sure.)
Anyway, I was wondering how much space it would take up. Will it take up a lot of space on my little ol 8gb?

It will not take that long. Don't listen to people saying that I'd takes 2gs when it doesn't. I updated my phone and i didn't even see that it took space. And it also depends on your personal preferences.

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