How long should a device reset take?

I have reset my Nexus 5 using the setting within the menu, and I have the "Erasing" Android animation still moving on screen...

...but I started this process over an hour ago and it is still going. There was a brief image of the Android robot fallen over with an exclamation mark, but then it went back to erasing.

Should it take this long? Could I do any damage by rebooting the device?

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