Hi BruceHarrisJr
The learn new sensor procedure requires the sensor to be awake, I suspect it's most likely not woken up when you attempt this, which would explain the long wait. The GS-911 expects the sensor to either be awake when starting the procedure or that you will wake it up with a wake up tool once you start the procedure.
Usually the cheaper alternative to a wake up tool would be to ride a few KM and park the bike in the garage (still idling), then run the learn sensor procedure.
Something to check however, when selecting Input sensor ID, does the rear tyre ID show as this image?
Kind regards
Ruan