ITunes hangs on "Backing up" after 4.2 update?

I just updated my iPad from 3.2 to 4.2, which appeared to work properly. The backup initiated by iTunes is hanging, it's been stuck at about 95% full for about half an hour now. Spinning beach ball and no response from iTunes. The iPad has the black screen with silvered Apple logo and shows the same progress bar, about 95% complete.
Is it time to force-quit iTunes? Should I wait longer?
Can force-quitting during a backup do any harm?
Thanks in advance for any thoughts/ advice...

I'll answer my own question, in case anyone in the future cares...
2-hour Apple tech support call with one elevation to a higher level...
It appears that one app installed on the iPad was installed by an IT pro at my wife's office, with his account and password. When I tried to update the iOS and sync the iPad, it was hanging while backing up the app whose account was not present.
I uninstalled and reinstalled iTunes, which did not affect the issue. I did a reboot of the (crashed, frozen) iPad, and it got partway through startup before appearing to crash again (not connected to the computer). After about a half an hour, the startup process suddenly completed itself, and the iPad was back, working normally. But it still wouldn't sync.
For that, I had to delete the app that had been installed by the IT guy's account. Now the iPad syncs normally, and everything's working.

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