Mine shorted to ground quite suddenly in the middle of a long circular route that I often take (on a section of the Natchez Trace, as a matter of fact). There was nothing slow or gradual about it. While doing a routine instrument scan, I saw the voltmeter take a sudden nosedive from its usual 14 volts down to just a hair over 12. So, I knew immediately that I was running on battery power alone. It was just as if someone had flipped a switch to the "off" position. Now, I know this is more information than you asked for, but I thought you might want to know a few of the particulars. Anyway, to answer your question, the odometer reading when all this took place was 50,505 and some-odd tenths miles.
'02 VN 750
stator replaced @ 50,570 miles
forks rebuilt @ 58,900 miles
currently on third battery & sixth set of tires