What turbo trainer model have you got?
Does it support the ERG training sessions, where you stick in a single gear (typically small ring and mid cassette) and then Zwift changes the power resistance?
What "trainer difficulty" (slope feel) are you using in other modes besides ERG? Default is 50%.
There's regular TT races throughout the week on Zwift, https://zwiftpower.com/events.php gives you the schedule, sign up and connect it to Zwift and Strava if you fancy competing for ranking points.
"Flying Cheetah" do weekly longer TTs that would suit your 44Km target, for example, this week it's https://zwiftpower.com/events.php?zid=272556
I'm using a Tacx Bushido that does support ERG mode, using the big chain ring to keep the chain path as straight as possible. As to the other settings: I have left them unchanged from default (because the Apple TV remove makes things really, really difficult).
Thanks for the suggestions, however! My main problem is that I don't actually "enjoy" cycling, but I like going fast on the bike (if that makes sense).
I also have a wife and kids which makes setting defined training times pretty hard and why I never do Zwift events... It might be something I look at in future, but I use the "workout" feature (with intervals) to make the grind less dull.
Another problem is Zwift trying to make things interesting: I chose what I thought was a flat route, but then Zwift though I wanted to try some KOM segments on two occasions. Not what I wanted as it isn't representative of what I am trying to replicate.

I think I will try Netflix next.
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