OOC: The PH estimate allows for short breaks during each hour (also the basic speed is 3.4 mph before allowing for those short breaks, not 3.6 mph). We'd never manage to hustle for 16 hours, due to the nonlethal damage automatically caused during such a lengthy period (you'd automatically take 127 hp of nonlethal damage following the RAW over 8 hours). The same for a forced march as I know Baeleth can't possibly forced march for much more than 5 hours at a walking pace before he automatically starts to fail the Constitution checks, and his chances of passing the earlier ones are lessthan 50/50, so he'll eventually pass out due to nonlethal damage. I mean you've got us going at a sub 4 hour pace to run a marathon and expect the characters to keep it up for 16 hours...I don't think so.