How long can SCANPST.EXE take to fix a large Outlook file?

I ran scanpst on a 19 GB Outlook 2007 file. It found errors, I clicked on backup and repair.

I realize that the repair process may take a long time.
Scanpst window is not responding – that doesn’t surprise me.
I checked with Task Manager, and I have noticed the following:

Scanpst takes between 1 to 4% of processor time
Pagefaults HAVE increased from 12850 to 21**9 after watching for 5 or so minutes
Pagefaults Delta has remained at 0

I looked in the Outlook folder, and I see a full backup copy.
The log shows that errors were found, but the last entry only says something about repair having been started.
I don’t see any temporary file.

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Do these observations indicate that scan pst is running?

Thanks.