Does this mean that, if I'm playing in the 8-ball (0/80), I have to move every 48 hours or forfeit?

No, those two days do not start before your 0/80 time has expired totally. So you can move up to 82 (decreasing as time goes by, of course) days without the risk of a automatic timeout.

Originally posted by Aiko
No, those two days do not start before your 0/80 time has expired totally. So you can move up to 82 (decreasing as time goes by, of course) days without the risk of a automatic timeout.