FWIW, I have observed racers who have attempted and succeeded at setting an hour world record. My coach has a protocol and it is a volume play that starts with strength and adaptation moving to 5 hour endurance rides and the 3 x 40’ @ 95% race pace at the velodrome with lots of motor pacing at the track thrown in.
What I find interesting is that success at the hour record is usually accompanied by setting a pursuit WR or PR. Since a 2k pursuit is so short one would wonder why hour record training would work so well. Hour record training builds a monster aerobic engine that becomes extremely valuable for most of racing except bunch sprinting or match sprinting.
It seems like the volume sets up the ability to do the 3x 40’ that in turn sets up the record assuming one is talented enough.
The hard part is making the training operational and hitting the record attempt window.
This protocol bodes well for the argument for big volume dosed properly against an objective.