It's your choice with the 1 hour session thing. However, maybe it would be best to leave when you no longer have an edge at the table. That is to say if there is a hudge fish there why not stay to take his money? If you are the best player at the table and there is alot of money on the table, why not stay so you can get as much as possible? Leave whenever you feel you aren't playing your best, but seriously try not to let that happen because of a bad beat. You have sucked out on people before, so it's only fair it happens to you every now and then.