Having same issue on 3 separate (one older pc, one newer pc, and a newer laptop) machines since grub stuff happened a couple weeks ago. Machines have had EndevourOS for at least a year (one for 2+years)
I had posted something here: ( Since grub issue extremely slow boots on encrypted btrfs systems ) and @dalto referred me to this post.
Does this sound like a waiting game? What’s boggling me is that on 2 of my machines I have a hard drive light, and from the moment it says “slot 0 opened” until I get to a logon prompt (as long as minutes in some cases) the hard drive appears to be going full blast