Disk Utility won't finish creating a 30Gb encrypted disk image

How long should it take Disk Utility to create a 30Gb encrypted read/write disk image on a 32Gb Kingston USB 2.0 flash drive?
Once I started the process the dialog box said "Creating Image 'backup.dmg' [thermometer bar] Creating...". The bar took about an hour to fill up completely. Then the filled bar went completely empty and the bar is completely moving candystripes as though it's made no progress at all. It's been like that for hours. Should I give it another few days or is this never gonna work?

Hi Michael,
Did you reformat it HFS+ or something else?
Some USB2 Flash Drives Write at a disappointing USB1 speed, but Read at USB2 speeds.
From what I can find, that isn't one of them and should take maybe an hour & a half to transfer 30 GB to it. Of course if write speed IS USB1, then you could expect 2 days or more.
I'd stop it. Reformat it, then make the Image on the HD and try transferring it.

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