Del Giudice M, Bonafiglia JT, Islam H, Preobrazenski N, Amato A & Gurd BJ (2020). Investigating the reproducibility of maximal oxygen uptake responses to high‐intensity interval training. J Sci Med Sport 23, 94–99.
You side with the academics and by all means that is your right.
As a practitioner in a field littered with academic research that is shown to be incorrect time after time, I could poke holes in that study all day long. n=14? No control group? No control for environmental factors such as diet, sleep or habitual physical activity? Unable to determine the degree of random within-subjects variability in observed VO2max
responses to training? Unacceptable p values?
And finally, the study highlights “a potential challenge” in the application of a personalized exercise training approach based on an individual’s observed VO2max or TTF response to a single training period.
The only thing that “shows” me is that a poorly executed study with limited participants, a lack of a control group and a lack of control over what tend to be highly influential independent variables should not be quoted as gospel.
That is my opinion but I respect your right to have your own.
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In The Myth of Winter Base he talks about 8-10 hours. Personally, I think that is a healthy amount of hours for an amateur and not very time crunched. You’ll typically do 1-2 sessions of intensity which leaves one plenty of time to work on aerobic conditioning.
To me truly time crunched is more like 4-6 hours.
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It’s more complicated than that. 
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When are these additions coming out @Nate_Pearson … need a rough ball park figure of a date so I can have something to look forward to! Can we expect major updates before Santa comes?!
In my case, I only signed up TR for half year since March, initially I jumpped into ‘Build’ phase and gained 6-7 watt after 3 weeks of build and then off a rest week, then my ftp drop. I started realizing the importance of base, so I started doing at least 3~4+ hours of long ride over weekend either outside or on Zwift. It does help, I kept doing ‘Build’ plan mid volume and combined weekend long WO into this one 3~4+ hours of ride. I start seeing gain on ftp gradually (5~6 watt every 4~6 weeks). In short, I think base training is important same as high intensity, you need a solid aerobic base to hold your high FTP. I actually feel that my power is much more realistic than ever, in the past I might have tested FTP at xxx, but I never able to put out high power for such longer period of time and this is the first year using TR I have seen this great improvement. Conclusion, I may see a useful training plan like this: a 3 weeks of the Base and then couple rest days, and continue 2~3 weeks of Build, and check ftp again, repeat this Base-Build-Base, something like that.
I’m pretty shure it is possible to describe a riders phenotype in a usable way in only two parameters (W’ and CP). Unfortunatly i dont have the data to verify (n=1).
Here is something for you all:
Quote:
“Every 24 hours, the model aims to correlate your best historical performances with your historical training inputs (pace, power, hr) to find a best-fit signature. This signature is then used to personalise relatively ‘normal’ plans that you would be familiar with ie you tell the model your training preferences and constraints. The resulting plans have some degree of adaptability both to your weekly schedule and changes in the signature.”
Sounds like a good match for TR…or what some of us are speculating as next Thing #1 or Thing #2 (adaptive training)…