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It doesn't work like that. Apples can't be compared with oranges.
But 90min at 80% FTP and increasing as possible is a hell of a workout.
Or 45min at 90%.
Ot 1h at 90%
Or 3x20 at 90%.Just do what you can for as long as you can. But an hour of good work is all you need.
You might need to drop the % if you aren't good at riding the tubro or haven't ridden it much recently.
You don't need to do 4/5h at Z2. If I did that, I'd be broken. Do 2-3h at proper Z2. So 65% to 80ish %. Just pushing on all the time. Could even then throw in a 15min effort at the end or 2x10 min int he 2nd hour. Just get creative.
I'm trying to build a decent base at the moment, having lost a chunk of fitness back in Sept/Oct. Work hours are insane (70 hour weeks the norm), so time on the bike isn't easy to come by.
My question: Is 2/3 hours at tempo going to give me the equivalent of a 4/5 hour ride in z2? I'm basically trying to replace a long Sunday ride with a less long turbo session.