Somewhere in the US, I'd bet money, is a small cable network still running their schedule/information channel from an A500 with a genlock.
At one point in the '90s it seemed like everywhere you went you saw Amiga graphics on a cable network doing some task.
I always left my Amiga running (when they were new) when I was home...sometimes for days without problems. I'm sure the cable channels ran 24/7. Granted you did see your share of guru screens running in the middle of the night, or the ever popular insert Workbench screen! Add to that the number of folks who used Amiga's to render 3D graphics and you have tons of folks who regularly ran the heck out of their Amiga systems for extended periods.
If my Amiga couldn't run for more than two hours without a crash I'd be looking at my hardware and software. If iBrowse is the culprit, it might mean you need to add a bit of ram. iBrowse loves the ram!
Bob