I assume you have already went through the initial system configuration and it downloaded the new software and rebooted. It can take some time but I can't say that I have seen it take more than 10 to 15 minutes to reboot and install. It can take a more than that to download (depending on hour connection, etc.) but it shouldn't take the long to boot after downloading.
If it is still hanging, I would press the Power switch until you hear the fan shut off and then let go and let it try to reboot again.
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