I recently purchased a 1992 GS500e that had a dead battery and a bad stator.  I bought a new battery and have a replacement stator but I haven't had the time to replace the stator yet.  The bike will run with the old stator provided the battery is charged but I wanted to know how long it would run for before running out of juice, don't want to get stranded anywhere.

10-15 miles. More if you unplug the headlight and even more if you don't use Turn signals/horn and stall it somewhere.
Cool.
Buddha.