Mountain Lion installation to new drive stuck

Hi all,
My laptop drive was starting to suffer from regular I/O errors which would freeze the machine. I decided to get a new SSD, and used Recovery Assistant to make an existing external drive a Recovery Disk.
Everything seemed to go well, but now it's been stuck at "3 minutes remaining" for well over an hour. I'm starting to think that the only solution will be to force reset the computer, but of course I don't know what this will have done to my installation. Has anyone experienced this? Does anyone have any better suggestions than to try again?
Thanks!
Ed

Hi,
Okay, so I restarted the mac and after reboot it continued with the installation - so no idea why it froze but if anyone else in in the same situation, probably it is actually finished with that step.
One gotcha that caused me an additionall stress - I was worried that there was an issue with the external drive I was using for the recovery, and so I used my imac to make a USB key into a recovery disk. This didn't work (I got the 'stop' symbol). I then tried another external disk. Same problem. By now I was getting very concerned... and went back to the original drive... which worked perfectly. As far as I can tell, you can't assume you can use a recovery disk made with another computer (even if they're on the same version of ML) with your laptop. I guess this is related to the drivers installed, but it is very very annoying of Apple (especially since the failure is so opaque).
Anyway, I'm done now.
Cheers,
Ed

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