I guess I’m not sure why a two hour shift would necessary be that much slower than a one hour given the IF they’ll probably target. Each rider is looking at 8 hours or so of total riding time over a 24 hour period. I can’t imagine their IF on any given lap would go over .75 or .8 (I could be completely off here…). Seems like that would be a pretty realistic pace even over a 2 hour period.
In your experience what kind of Intensity Factors do you typically shoot for on a 24 hour race?