Re: When are you riding for too long?
After break in of about 50 miles or so, and if the jetting is right, They don't need a cool down period.
In fact, the longer the run periods are on any normal engine, under normal usage(like cruising)the longer the useful life in hours of run time.
Engines wear the most upon startup and warmup, plus the effects of heating and cooling cycles .
There's no reason you couldn't run one 24/7