Based on Foxys figures.
You looking at an average figure of 66% of max heart rate.
Either you are incredibly fit Or you're not trying hard enough
over the last seven years-
All training rides 2 1/2 to 3 1/2 hours at 80%
Turbo training can be in the low 90s.
12 and 24 hour rides I have managed 73%.
i'm struggling on the treadmill at 73%.
Two 3 1/2 hour training rides recently I faded halfway to the end so only managed 73%.
The medication I'm on at the moment means I should devalue heart rate figures by 10 bpm.
I.e. I should only aim for a heart rate 10 below what I am used to, that's probably about right because my max is only hitting 170 maybe and it used to be about 180.
Training and performance has gone to pot recently as I am not leaving the house, no idea when that's going to change, training at home is nothing in compared with training out on the road.
I look forward to better days to come.