Geo - wow, 100PW would be some serious accomplishment!! Sounds like some helps are at home to attend the dog duties.
Regarding the coast to coast bike race, I found this;
Team Action Sports from Bakersfield, California, established the record for the four-person male division in 2004. The team, whose members were Nathaniel Faulkner, Kerry Ryan, Sean Nealy, and William Innes, averaged 23.06 mph (37.11 km/h) to complete the 2,959 miles (4,762 km) in 5:08:17. The record for an eight-person team was established by Allied Forces - Team 4Mil/Strategic Lions in 2013. This squad of riders completed 2,993 miles (4,817 km) in 5:03:45, for an average speed of 24.19 mph (38.93 km/h).
Totally crazy. The guy I was talking to on Sat told me his team's goal was not to get passed by all-female team. He said they accomplished that. His team rode in an interval of 20min. Can you imagine riding 20min very hard and rest 40min (I think that's what he said...) repeat multiple times... and getting about 5hrs of sleep every day.
5.5mile run. Felt some tightness in hamstring. But felt pretty good at sub 9 pace.