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Beats me! Or a MAP test and just take a % off the end of it - much easier as there's no pacing involved, you can do it blind if you've got someone to help you and it's not as affected by residual fatigue.
Having said that when you get enough data and a better feel for things you don't even need to do them - NP over a ~20min duration will get you most of the way there if you're doing intervals on the turbo or something, or a 25 mile TT, 1hr chaingang, etc.
Ohh.. That's what it's for. Weird
What's wrong with 6 mins progressive effort, and a couple of activation sprints?