How long should reboot take after installing Mavericks?

All was well with my 2011 iMac until I decided to upgrade to Mavericks yesterday. I figured/hoped most of the early bugs must be squashed by now. The download took forever (but that's due to our slow bandwidth here) and the re-start has been going on 12+ hours. It's obviously hung up. I get gray screen with Apple logo; i have cursor control and no spinning ball. Occasiionally it still makes some sounds like it's processing. I've tried safe re-start, re-setting PRAM, ran disk utility to repair disk and all is supposedly OK. Thank God I have this MBP as my alternate device. Any advice as to next streps?? Chuck it all and restart from Time Machine?

If you haven't tried unplugging your peripherals, I'd do that, and try another boot in safe mode.
I wouldn't do a reinstall from TM, as that may reinstall whatever problem that you are having that is causing the installation to fail.
I'd bite the bullet, back up your documents, reformat (erase) the HD, and do a clean install.

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