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…
85-88%, depending on how I feel. It’s the NP of some of my 2-hour rides. But these feel like a personal time trial like no breaks, never stop, take risks at intersections lol, must be faster. So it’s the absolute highest I can crank out compared to my FTP.
Last year I did a 25m TT one week and a 50m TT the next and although my power was a bit down on my best due to a lack of focussed training during lockdown I averaged 242W on the 25 and 229W on the 50 - 229/242 x100 = 94.6% - needless to say I finished much higher up in the 50 than the 25 
…plus I am doing plenty of VO2/ super threshold this year in TT prep - as I can obviously ride until the cows coming home at SS! - also both were hilly sporting courses so I did a 59 for the 25 and 2 hours and a few secs for 50 so it really was hour/2 hour power…I did do a 54 for 25 but that was on a flat course!
86%. In the interest of science (and this thread) I did a test yesterday - BRVR 2-hour continual climb of 7% av. gradient. Could have maybe pushed harder but didn’t want to blow up 
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Current FTP set via Kolie Moore basic test.
88% of FTP; 96% of best 1 hour.
Just what I’ve done in 2021, not trying for personal bests.
I was going to collate all the answers in this thread, but between different ways of measuring FTP and some admitting that their effort was less than maximal, it doesn’t seem worth it.
Generally speaking, though, it seems that roughly 90 plus or minus a couple of percent is the answer.
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I refer you to my previous reply!
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I’m impressed by all these high percentages. High percentage of FTP for a long time is probably my biggest weakness since I train shorter power much more but also because I don’t know where I could test 2hr power if I even wanted to.
Is everyone who isn’t using a 50 TT doing it on the trainer? That would take some serious mental strength.
40 mile loop out of my garage.
@BigRed if you’ve decided to work on it then I’m quite certain you’ll see material improvement in short order!
Another thing to remember about threads like these is that they tend to follow the ‘law of increasing numbers’. 
If somebody say 10 & you’ve done 11 then you’ll say 11. If you’ve only done 9 then you’re more likely just to go on to the next thread. Ha!
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@BigRed, For the record, I did not specifically test my 2-hour power. I just used the Personal Record section on the TR site to view my power curve and picked the max two-hour point. It happen to have been Wright Peak -2 (3 x 30 with one minute rests in the middle) where I bridged the gaps and bumped up the difficulty a little. It ended up being about 95 minutes of sweet spot and 25 minutes of high endurance. Any of your two-hour rides will give you a percentage for the purposes of this thread.
Well in the interests of breaking that ever increasing nature…
Based on average power, my 2 hour best is 85% of my 1 hour best average but then I’ve never tested it. NP is probably a better measure for me, for which my best 2 hours is 93% of my 1 hour best NP. But… as I said, I focus on short power and crits which are often a fraction under 60mins. Comparing those efforts against my best FTP my 2 hour power by NP is just 82%
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I don’t think I’ve ever felt the need to increase the power target in between 3x30 minutes!
Probably call that 88% to account for altitude at the top. I did it with 245 in 2018 but really not sure what would be reliable measure of FTP back then. It’s probably about 90%.
On the main question, I don’t have any proper 2:00 efforts. But my best 1:45 is 262 and my best 0:45 from a Kolie Moore FTP test is 274. So 95%, and both definitely full-gas efforts within a few weeks of each other.
(Probably time I did some vo2 max work!)
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I do that to any recovery interval longer than two minutes. My very first structured training plans were preparing for a gran fondo / century (not from TR) and always had the recovery intervals around 75% - even their 3-minute VO2 workouts.
I’ve kind of always stuck with that since I exclusively ride 3+ hour events where you’re never really doing 40% for anything other than a descent. As my FTP has improved I have reduced the intensity of the recoveries to 60-70%, but not as low as 40% (unless doing short shorts).
Now, if I’m really struggling on a workout the first thing I’ll do is significantly reduce the intensity of the recovery interval.
My advice is tuhnotoo.
I wasn’t happy with my performance on yesterday’s test so repeated it today with a bit more conviction 
90.5% of current FTP (260)
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