No Condensation on Discharge from Indoor Air Conditioning Units: A Cause for Concern?

Today I noticed that during the operation of home air conditioning there is no condensation on the discharge from the indoor units. I have 4 units and 3 drains at home and none of them drip condensation. The air conditioning seems to be cooling, but I'm afraid something is not right here. Someone help?

Maybe the air-conditioners are working, there is little condensate and they will not have time to flow ... What are the lengths of the condensate drain, possibly what diameters, pumps or gravity. The question is what climates (in the sense of what indoor units (wall or ceiling). How is the house insulated, and what is the temperature in it and what is the temperature set on the climate ... It would be nice if you sketched something. As you can see, too many questions and too much little information from you.

Air conditioning (CREE) 4 indoor wall mounted units and one common outdoor unit. Drain pipes of various lengths. Horizontal from 2.5 to 5 meters, all gravity. Set temperature 22-23 degrees outside probably a few degrees more. It worried me so much that I don't remember there ever being no condensation. But maybe it's actually some kind of relationship between the temperatures.

What's the humidity inside? Set the air conditioning to minimum temperature and high flow. Condensation should appear within a few minutes.

For me yesterday it was 25 ° 60% and for two hours two liters of condensate were collected.

The absence of condensation on the discharge from indoor air conditioning units may indicate potential issues that warrant further concern.