I did 120 min@90% following the Sweet Spot Progression.
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I’m just looking at my best 3hr pwr. It should be easy to beat that.
See? This is how it started last time…
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Should I run a search on my 4 hour? Already found the two best 3 hour rides (my coach was pushing out my 3 hour power thru end 2020).
3h is way interesting than 2h for me recently. My 3h pr is from Z2 with efforts like ftp or o/u but I wonder how high it would be if I push steady state effort. Completely useless metric but I wonder more and more about this.
Looking at my past data, my best is ~80% of my current FTP. And that was way back in July, when I wasn’t doing any structured training.
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Just did a two hour ride this afternoon. If I’m comparing it to my last FTP test, this Monday, 92%. Compared to my highest FTP over the last 90 days, 82%. I took three weeks off and my FTP dropped 25w or around 10%. IF of the ride is 0.93, so the 10% drop is true. 
50m TTs are usually 90-92% over 2ish hours.
100m TTs are usually ~85% over 4ish hours.
So 86-89% would be my guess
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A couple of years ago, I posted a google form collecting average power for 10, 25, 50 & 100 mile TTs. I was curious about the intensity, particularly for 100 miles. Got about 60 responses.
Using 25 miles as the reference, the median intensity for 50 miles was 0.92, with a lower quartile of 0.89 and an upper quartile of 0.94.
The median intensity for 10 miles was 1.07, with a lower quartile of 1.06 and an upper quartile of 1.09.
The median intensity for 100 miles was 0.84, with a lower quartile of 0.80 and an upper quartile of 0.88.
I would hypothesise that for longer distances there is a wider range of intensities since the duration of the efforts would vary more.
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105%
I did a few weeks back 2h45 @ 85% . That was fun 
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I did this last summer, just to try my endurance so ~3h at 85% and i could’ve kept going, fast and fun. So at that time my 2h power was probably >90% just because i did a lot of tempo/SST (long efforts, long intervals).
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I did a 100k zwift race back at the beginning of February and got 2h20m @ 300avg/308NP. At the time my FTP was set to 335 from a test in November, but I retested in march and increased to 350.
From the old FTP:
Avg. 2h20m @ 90%
NP 2h20m @ 92%
From the new FTP:
Avg. 2h20m @ 86%
NP 2h20m @ 88%
Based on these numbers I guess I could go between 88 and 90 percent of my current FTP for 2hrs flat. A big factor in this though is the stage of training you are in at the time of the test. A two hour max effort is no small feat and you results will vary based on a number of factors such as mental state, training phase, amount of training specify to the effort, and amount of chronic/acute fatigue you are carrying.
After unpurposely doing 291 W (~91% of FTP) for 2 h during an outdoor “mixed session” mid September last year, I did set 2h @ 300 W indoors as my winter training outcome goal. Created a workout in TrainerRoad with a main block of 8 x 14.5 min @ 94% FTP + 30 sec @ 65% FTP which, in combination with a raised FTP to 327W, resulted in 302 W over 2 h (92% FTP). The first 7 quarters were fine, but during the last 30 sec “break” HR did not drop as expected and the last 15 minutes became quite a struggle, it was obvious that my tank was running empty…
However, I would rather keep raising my sustainable power than push the 2h average closer to FTP. Next up for the spring training goal could be 4h and 6h at some visually appealing number (W/kg or absolute power), just to have something to strive for.
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My 2 hour pr record is 94% of my 1 hour pr at the moment.
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That’s really interesting. Thanks for posting
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I am 0.83 for 2 hours
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Disaster (fasted)??
My best 2hr is 91% and I need to be in really good shape to do that. I also did 88% for just over 3 hours in the same race (solo break) and that 3rd hour was seriously mental. I think those are about my limits when in top shape and well fueled, reasonable temps, etc.
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Isn’t there a site something like BestBikeSplit?
Used it a bit years back. They must have a calculation they use for every duration. Wonder how they do it, or what model they use to calculate it.
I did a 4hr ride, came in at 77.63%, didn’t set out to be a maximal 4hr though.
Also, don’t do this. It is a horrid idea…