This is an important question, there is a discussion of the topic here as well: Combined Zones on Weekly Summary - #5 by Gerald.
I think that it is next to impossible to reach a 80/20-target if you calculate it by minutes/hours spend in each zone on a weekly basis. So my question is if it rather should be calculated on sessions per week - that is, if you do 5 sessions, only one should be intervals above FTP.
So I would like to know if is NOT the wright way to estimate your weekly distribution by looking a the weekly distribution in intervals.icu.
Morten