The hill sprints themselves should be short. Book says 6-8 10 second hill sprints, with two minutes in between. So 130 seconds for each rep (10 seconds plus 120 seconds recovery). 6 of those is 12 minutes total. 8 reps would be a bit over 17 minutes total.

So 35 for warmup, 12-17 for the hill sprints, and cool down of 20 minutes.

Leivo:

I think you have misunderstood sets and reps here.

As an example with one set of hill sprints:
Warm up
6 to 8 sprints resting 2-3 minutes between sprints.
Go home.

If you do 2 sets then everything is the same except you take a bit longer rest after the first set of sprints before doing the same again.

I’m sorry this is confusing for you.

Scott