I'm going to start the All Stars Championship (International B) soon. There are five races to be done - Do you know if we can save after a race or do you have to do the whole championship in one (long) sitting?
There's an option called "suspend series", you use that to save it, leave it and pick back up. I haven't tried it yet, but in GT5, if you used it, you couldn't go do other things in-game. It only lets you quit the game then when you boot it back up, it'll let you resume only.