Mine updated in less than 15 seconds
1: Leave Airpods in case with case open
2: Verify Airpods are connected in Bluetooth settings
3: Go to Settings/General/About and look at for Airpods, which should appear immediately after SEID
I stayed on the General/About screen for a about 10 seconds, and my Airpods disappeared from the screen.
15 seconds later they reappeared with the updated firmware
Thanks. worked here