At first I thought it was hanging, so I signed out of my Quicken account, signed back in, rebooted (as per previous advice which normally fixes the problem). But then I realized it wasn't hanging, just taking incredibly long time (~15 minutes). No error messages displayed, but it did display "complete" prior to finally updating my accounts.
Windows 10
Quicken R52.28, Build 27.1.52.28
Issue started 9/29/2023, after I update to Quicken Classic