display rescan duration

[simoncn]

This depends on the speed of the computer or NAS that you are using to run MinimServer and the speed of the disk on which your library is held.

The first scan takes longer because MinimServer is building a cache that it uses to make subsequent scans go quicker.

I would expect it to take less than 5 minutes to scan 1 TB if not much has changed from the previous scan.