My old A1200T used to run for months before I would reset it and that was 24/7.
My A1 with OS4 update 4 runs about 10 hours a day being used constantly, including using IBrowse. I now turn it off at the end of the day, only due to the very high cost of electricity here now. It did run 24/7 for the first couple of weeks when I first got it.
Ciao,
Trev Daley.