Iphone 3gs will Sync for hours without finishing

I wanted to install the 4.0 OS on my 3Gs and itunes prompted me to upgrade to the newest version. I did and then went to upgrade the iphone. It wants to perform a back up first. The phones LCD will stay on saying it is Sync'ing and Itunes says the same. Last night after over 3.5 hours it was still sync'ing. Neither Itunes nor the phone were frozen and I get no error messages except when I finally unplugged the phone; the error message popped right up saying that I unplugged it.
Anyone have an idea of what is wrong?

Hello,
I had an iPhone 3GS with long sync time. My observation was; once it can complete a long sync, it could complete next sync in short time. The next sync must also take place same day or next day. Your applications should not have too many changes.
My iPhone 3GS died yesterday during iOS 4.0.1. upgrade. It synced for 3 hours for the last time, then gave an error message. That was about it.
Good luck,
Zekiye

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