Bibster, you wouldn't have to. you'd just run all four 30-min. heats in a row. except that it's a 4-person team minimum so you couldn't do either one... but i'm sure that you could find a home at least on our team.
i was the only guy that i'm aware of that did two successive 1/2-hours, because of the random rotation refresh and that i wanted to run that mean white lane because i'd really hooked up on it. my hand was numb (just like me! :lol) at the end but i pulled it off.
speedy