Exercice as a % of TDEE

In order to properly balance exercise ... how to determine the right amount od calories to burn ?
does it make sense to work out a percentage of TDEE ?
or should I work out as a percentage of calorie intake ?

I had read years ago that to get truly systemic changes to your body, you needed at least 2000 calories worth of exercise spread throughout the week. I of course jumped on that and tried for 4000! Always the thinking that if a little is good, more is better. Learned from that type of thinking.

And it made the distinction between daily activities being increased, which is great for calorie burn increases but doesn't count, and aerobic that would improve cardiovascular health. Strength training was separate activity.
That comment was probably based on idea even then that workouts should be fed if doing it smartly.

Sadly I don't recall some footnote saying the standard "this applies to 2000 a day diet level" or such. In which case it would be tied to TDEE.

And that makes sense that there is a most beneficial zone based on your own TDEE level. Of course, the mere act of more exercise increases the TDEE, but I get your idea.
I know the studies that show past 30 min of cardio the stress hormones start rising and the HGH start losing the battle, so more stress to the body than perhaps required, so not as much bang for the buck you might say. But then again, you may really enjoy it.
And of course cardio after 60 min starts having some muscle breakdown unless you are really keeping it in fat-burning zone so as not to use up liver glucose, so that's not great. Especially on a calorie restricted diet, very difficult to build that muscle back once gone.

That's what I remember as recommended from the past.