That long run every week is very key.
but you don’t need super high overall mileage unless you want to win races.
my peak mileage weeks for 100’s is only about 75 miles a week, and only about 60 miles a week for 50’s. I’m not any slower than some who do more mileage. I think the key is a deep long term base.
One way to get those long runs in is to run more races. Use 50k’s as training runs for 50m’s. use 50m’s as training races for 100m’s. I’ve run 50m races only two weeks apart when training for a 100.
I don’t think you need back to back runs to train for 50m’s. but a couple of them would be helpful for 100m’s.
One problem with too many long slow runs is they make you slower. sure you can go all day but you’re like molasses. a few 5 milers thrown in as speed work can help break things up.
Nick Clark is definitely a front of the packer. His blog details his weekly training and shows how he mixes it up.

