I confess to this. In my defense, this behavior is driven by friendship
I attended a milonga just last night. I showed up at 20h20 and left at 23h45; so, I was there for 3 hours, 25 minutes. I sat out exactly one tanda – my two shirt changes were Superman-style in the back corridor during cortinas, and all of my drinks of water, breath mints, face wipes, etc. were during cortinas, too. It's safe to say that I danced a lot and with a lot of partners. Yet . . .
On the way out, I passed two people who wanted to dance with me and hadn't, who hinted that we should dance next time. This morning, I had three Facebook messages of a similar nature.
Now, I realize that the sense of obligation resides entirely in the mind of the person feeling it, not the one who's ostensibly imposing it. I've been to therapy.

However, I actually
like my tango friends, and really do want to dance with them. So, when some performance cuts my hypothetical 3:25 to 2:55, it also cuts out a few tandas with friends, which is disappointing on both sides of the equation.