Long vs. Short sweetspot intervals

Is there different adaptations that happen when you do say, 3x20 at 90% vs 6x10 or even 12x5 at 90%? Same time at sweepspot over a 90 minute workout. I get the psychological impact of gutting out long intervals and the ability to do them, just not sure if it’s the same physical demand.

4 posts were merged into an existing topic: Sweetspot interval length - Short vs Long