DS's parents appt (primary school) will be done by DP, as I'll be at work that afternoon. DP is usually fine, but I have had to gently steer him out of the room to keep to time before.
As for DD, her secondary school has most of the teachers sat at tables in the main area to make going between them easier, and an online booking system that prevents appts being made right next to each other. It's set up to ensure a 5 min gap between each appt to allow parents to get between teachers without too much overrun/time lost.
Works mostly okay, although on one occasion we swapped appts with another set of parents as the parents before them had overrun and it allowed them to reach another appt on time and come back. We did make sure the teacher knew so they weren't surprised.
I also only book appts with the subjects that are either necessary or are the subjects that DD is considering for options (Yr 9). She hates PE, is bottom set, but as she still gets complimented and receives points for her good attitude and effort in the lessons, she and I have agreed she just regards it as her necessary keep fit.
I don't bother going to see the PE teacher.