If you follow more of a pyramidal plan in which you incorporate some Zone 4 (just below threshold) then you can add a modest amount of Z4 work per week.
However, If you follow a true polarized plan, in which your high intensity days are above threshold, then there is only so much you can increase. The Work intervals can't get much longer, but you can add more sets.
It could look something like this:
Beginning of Training: 7.5 hours total per week
Base Days- 4 days (5 hours of base)
(Days not in any particular order)
Day 1: 1 Hour
Day 2: 1 Hour
Day 3: 1 Hours:
Day 4: 2
High Intensity Days: 2.5 hours per week.
Day 1: 3x 15 minutes Hard with 5 minute recovery. (Plus warm-up, Cooldown, and recovery = total ride time of 1:30 (Zone 5a Interval duration of 45 minutes)
Day 2: 4 x 5 minutes Harder with 5 minute recovery (Total ride time 1 hour) (Z5b Interval Duration of 20 minutes)
At the end of Training 12:15 hours total per week.
Base Days- 4 days (9 hours total)
Day 1: 1 Hour
Day 2: 2 Hours
Day 3: 2 Hours
Day 4: 4
High Intensity Days: 3:15 hours per week.
Day 1: 4x 15 minutes Hard with 5 minute recovery. (Plus warm-up, Cooldown, and recovery = total ride time of 2:00 (Zone 5a Interval duration of 60 minutes)
Day 2: 5 x 5 minutes Harder with 5 minute recovery (Total ride time 1:15 hour) (Z5b Interval Duration of 25 minutes)
ClimberEvan- Clarification:
When we were talking about 80/20 before and I said that it could be closer to 70/30 based on time was based on Workout times. In the example above the "Final week" example is about 27% for the total time of the two interval days.
However, if we looked at it based on just time in zone, it is much much lower. In this example, total time above threshold is basically 1.5 hours out of 12.25 hour training week, which is a bit over 10% of time. I'll edit above for clarity.
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