iPhone 5 - Restoring from back-up - Help needed.

Hello,

My iPhone 5 arrived today - Yey! In preperation I backed up my old iPhone 4 to both the iCloud and to iTunes, ready to use one of the back ups on my iPhone 5.

I plugged my iPhone 5 into my computer and it came up in iTunes, so I chose to restore from the iTunes back up I had done earlier this morning on my iPhone 4.

Since doing that the iPhone 5 disappeared from iTunes and the screen on the iPhone reads 'Restore in Progress' It has been like this for about 2 hours now and I am worried it has stuck. As there is no iPhone coming up in iTunes there is no way of me knowing the progress of the restore or if anything is happening at all. Obviously I am nervous about unplugging and trying again.

2 hours is a pretty long time right?? What should I do?

Just to add, there is also no indication of progress on the iPhone itself either - i.e. no little spinning wheel in the top left corner etc.