Disk utility is hanging trying to erase ssd. Can I force quit?

I will keep this sorry Halloween tale short. And, not bore you with how I got to where I am, as we'd both need drinks if I did.
Needless to say, here I am watching Disk Utility making zero progress on erasing my SSD.
Progress bar os stuck 1/3rd of the way and the app has been running just over an hour.
SSD is OWC 6G Mercury Pro 240gb
Activity monitor shows activity in DU, but again, no progress as noted by static blue bar.
Drive got messed up during Yosemite install.
The SSD, once proudly a Guid Partition Format pre-Yosemite, had been converted into a Logical Volume Partition, without permission.
No, I did not enable file vault!
Now, getting corruption errors all over the place, I set out to reformat, and here is where I am, stuck.
Is 70 minutes without progress bar movement too little time?
How long could it be to erase?
I also must tell you that following instructions, I removed the corrupted sad and put it in a firewire 800 enclosure, while running my MBP with a 7200rpm Mountain Lion, pre-Yosemite clone.
Textbook cue of why you make clones!
Question: Is it safe to force quit DU?
Or should I sleep and see if anything happens by morning.
Thanks to one and all.
I know my Halloween is certainly scary enough…!

Well, thanks for the looks…
I'm calling it a night.
The DU progress bar still hasn't moved, (visually), in 4 hours since first post.
However, in Activity Monitor, DU still shows both read, and write, disk activity. Pitifully slow. But steady
I'll check in here again in the morning before, "pulling the plug."
Best,
Rich

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