Strava

I could have told you that :-)

You seem to have developed some great endurance through very few endurance rides, so whatever you're doing on the turbo must be working.

Cheers.
Believe it or not. I mainly do <45min sessions of sprint intervals. As a middle aged dad, and hobby cyclist. This is obviously of crucial importance cough.

The endurance thing is more a natural ability, and a massive dose of bloody mindedness.