Yeah, I'm in slot one, the more reliable slot, with just the one card. The 25k songs use about ~180 GB on the card.
The ~30 mins I'm talking about is after a FiiO app database reset and full scan. If you all are getting 4 minute scans with similar data, wow, ... just wow. Maybe it doesn't like my folder/file names or something. No idea, but mine is not quick. I'm not sure it's a full 30 minutes, but it's definitely not less than 15. It's a definite "go away and try not to look at it while it's updating" situation.