Same here. HDD with 3 partitions, all encrypted. Mounting all of them is a matter of 2-3 minutes.
Started a while ago, even with latest MacOS 12.6 on an M1. You hear the disk working hard. Not sure what it's looking for to make the mount happen. I can only speculate that it tries to mount all of the partitions at once, or in parallel respectively, and then the heads fly back on forth wildly over the disks, since with an external SSD drive things do mount way faster.
coderslagoon
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