How long should the 10.8.5 update take to install?

Because it's a supplemental update, I figured the 10.8.5 update would install in a couple of minutes. It's been over 20 minutes since I clicked Restart and my iMac still shows Less than a minute to go and the progress bar has been in the same position for quite a while. Is this normal?

I also had the same issue with the 10.8.5 Supplemental Update 1.0.
2009 27" iMac (original hard drive recalled and replaced; 8 GB of 3rd party RAM added; no other notable additions).
I'll see if Apple has anything else to say about it.
I guess I'll just back up the drive and hope the Mavericks install works better...

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