When the internet first started becoming a common thing, most people had access at work, but not at home. That's why many game sites set up their systems to not timeout over the weekends. I don't think we need implementation like that much anymore, since most people have access from work, home ,and even elsewhere (friends, palm pilots, internet cafes, etc.), but that's generally how it is. Maybe keep it in place for 1 & 3 day move limits, but get rid of it for the longer limits.

Thad