Just weighing in on this.
I just ran the check database in calibre 9.16 on a db file off 166 mb, holding 120000 books in it. On a i7-3770T running at 2.5 ghz, 32 gig of ram and running off of a sata3 3 terrabyte drive with transfer speeds of 100mbs + ( i think read speed is about 140mbs) It took about 4 minutes.
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