In these cases, we recommend an 80/20 50 mile plan and “level down.” If you would normally get a Level 2 50-mile plan, get a Level 1 instead.
Frankly, I can’t fully endorse this solution. I just don’t know how this will work. I’ve made the recommendation many times for 60, 65, 70K races, but no one has ever come back to say “you suck!” or “it worked great!” I think that the best option might be to find a competitor’s dedicated 60K plan and adjust the intensity to 80/20 ratios. It would be disingenuous of me to claim that my “level down” idea would be superior.
Thank you for your honest answer. What is the recommended training block time for an ultra (60K) for someone who finished two marathons in 3:50 hours? I’m considering to purchase a custom plan from you, because i really love the 80/20 method.
I’d say 18 weeks averaging 7 hours a week would be a solid minimum commitment for a successful 60K event. For someone who can run a 3:50 and has 2 marathons completed already, maybe 6 hours a week average, but still 18 weeks. So for you the 50M Level 0 or Level 1 plan would work just fine for a 60K, and I’d start with the Level 0.
An 80/20 custom plan is a good idea. Matt would provide that and does an incredible job. It’s just a bit expensive, and I think you could get 90% of the benefit from leveling down on a 50M plan.