So... it looks like I was a tad optimistic about fulfilling this challenge. I started with 3x40 at sweet spot but had to cut that third interval to 20 minutes. I then attempted 4x30 at low L4 but only completed 3 of them. I did manage to get through a second attempt at 3x40' at sweet spot but I had to lower my power to high L3 to do so but at least I did put in the 2 hours at sweet spot so I feel I am making progress. But extending time spent at L3/L4 is proving harder than I anticipated and I can see that 2 hours at L4 is not a feat to be taken lightly. Might have to turn the music up ;)
-R













