Bonjour
I set a stopover of 50% of the duration of flight that they make, that is to say that if my A380 makes a 12-hour flight, I leave it parked at destination for 6 hours before its return flight time,
You'll regularly see 2 hr or less stops routinely programmed at airports for Long Haul heavy types these days. and that's mainly due to the time it takes for the cabin to be cleaned and galleys to be refilled. The aircraft systems do not need to "rest" so the actual technical turnaround might just be a refuel and the engineers checking the engine oil levels and walking around the aircraft to check the gear and airframe for any signs of problems.
As an extreme example the shortest turnaround I've seen for a 747 was just under 40 minutes ( brakes on - one pax off (medical) - top up of fuel, check of engine oils - sign paperwork- push back- depart).