Here is an example of a DB rescan duration on my windows desktop workstation with the music management software i use. It is a HP Z620, XEON Gold, 16GB Ram and the harddisk the DB is on is a normal harddisk not a SSD.
The rescan took 5.03 minutes for more than 100’000 files music, cue, pictures, m3u, pdf, log and other information i add to an album. Each album is saved in it own directory The number 100’000 is possible because i copied my music collection 5 times to measure the performance of DB scan and handling. The actual number of files is around 20’000 FLAC files with tags, pictures and all that.
This is another scan of the same DB and music library with the older version of my media managemnt software. It takes longer as you can see because the DB and algorithms are different. The information that is read into the DB is exactly the same.