Just did 10,000m in 40.:18.9 . I could get rid of some of that 18secs by not having to remove my gloves halfway, and doing up my shorts so the lace doesn't get trapped in the seat bearing with 599m to go. Still, it'd take a consistent >1000kcal hour rate, and I'm not getting enough air in me with a "breath out on the drive, in on the recovery" pattern - felt like I was suffering for lack of air in the last 1500m.
That's my 8th go in maybe 10 years, so pleased with my progress, but loads to learn. Any instructional video recommendations welcome - ours is a hire machine, so no gym bunnies to copy.