But do you need to run continuously ?
Just check this fella out. Or can contact him?
https://www.youtube.com/@RunUncleRun/videos
Best to leave these 100km and above events to those very experienced ones. Even experienced fellas DNF not rare occurence. Can have other challenges. Or maybe it's coz for me i dont really take DNFs too well, so just keep it simple and short and sweet, gao dim. lol
For the vast vast majority of walkers/runners, it is not fun at all. There are other challenges, can try like walking faster than other joggers (already off my bucket to-do list).......in fact last year AHM i did just that coz last 3 km suddenly ITBS pain kicked in.

Right Kneecap just could not be bent (extreme pain), maciam like auto lock-up....i walked @ 7min pace for 1km and then 6 min+ 2nd, and then final push 5min+ for last km.
Found it
Anyway, from what i remember from such large scale events, lots of accelerations and decelerations needed once you get caught in "jam". Quite bad for the knees/joints. Coz many would be running at 6-8 min paces. You gun at 3.30-4.00 is sorta asking for trouble to yourself and risking injury nia, other than wasting a lot of energy to do that.