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Without using their plan builder, their standard suggestion is 2 blocks of 6 weeks of sweet spot base work, then a 8 week build block, then an 8 week specialty block.
If you followed this to the letter, its around 28 weeks, which would take you to summer.
That would be around 126h of turbo time on a low volume plan, and roughly equivilent of 4000km of specific training miles on the road.If you've followed the plan, there is no way you wouldn't be fitter at the end.
Trainerroad or Sufferfest should release an updated version with bell curves for different power durations. They must have a huge data set, far more than Coggan had to work with.
Not that it makes any difference, but it is interesting to see what percentile you are at.
Listening to trainerroad podcasts, their stance seems to be about improving your FTP and then see where your race winning talents are. And if you have 4.5h of turbo time available, sweet spot work is the best bang for buck.