Disk Utility has been Shrinking disk for several hours....

I have an external HD (FW800/GUID) that has 2 partitions in it that I'm trying to reduce the size of one of the partitions to make room for a third without deleting anything on the drive. Disk Utility has been 'shrinking disk' for several hours and I'm debating if it's hanging. I see no activity on the drive, so I'm not sure what's going on.
How long should this typically take to finish?
the partition in question has about 1.3T of data on it and I'm trying to free up about 300G that's unused.
Should I be concerned? How long should I let this go before bailing the app?

What's the chance that the data will be corrupt if I force quit disk utility?
In the middle of repartitioning that has apparently hung? I would guess it would range somewhere from high to certain. You should immediately use Disk Utility to repair both partitions after force-quitting.
I didn't make a backup
I hope you're lucky, but I have the feeling you're about to learn your lesson about not having backups in a very severe way. If the drive cannot be repaired at this point, you may need a file recovery utility like [Data Rescue|http://www.prosofteng.com> or [File Salvage|http://subrosasoft.com/OSXSoftware/index.php?mainpage=product_info&productsid=1].
In the future, you absolutely must have a minimum of two backups (three copies) of any data you can't afford to lose.

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