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How long is normal?
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I don't believe there will ever be a Normal as this is going to differ from system to system and would depend on what you have installed, first there are programs to close and on boot program to start apart from avast. So it is different to say what is normal, for you, Mine as Alan said rebooted without hang in what would be about Normal on 'my' system.
However, I would wait much longer before hitting the power button as my feelings are not to interrupt this process to early as I don't know what the consequences might be (hence Alan's repair suggestion), I would probably go and have a coffee, etc. and come back.