I too tend to ride alone and in the middle of nowhere. BUT I just replaced my belt at 105K miles on my '99 I/S. Belts were still in good shape.
Without digging through the older (GL1100/1200) service manuals to check: Didn't Honda spec a replacement/mileage interval for these belts once upon a time?
Most likely. But the world has moved along. Now it's inspect at 100K miles. No time limit.
I did my 88' GW at 60K miles and 25 years. No issue. But with the cost of the belts being as low as they are, it is inexpensive to replace them when they are inspected.