What if constant exposure to 5G frequency needs time to become detrimental?

The only cumulative effect that non-ionizing radiation has is an increase in temperature. So if there is a pause that is long enough to get rid of all the excess heat in the affected area (say 15 mins to an hour) then it returns to normal. Beyond that there is no lasting effect that EMF waves can have on atoms and molecules, except for ionizing them and atomic radiation, both of which require much higher frequencies (and atomic radiation, breakdown of the nucleus, requires 1000x more energy than ionization)

And because of the photoelectric effect, it's known that a higher frequency is required to produce ionization. For a lower frequency, there is no intensity high enough that will produce ionization. The only effect it can have is through heat, which is just kinetic energy of molecules, vibration and translation across all movement modes of the molecule. And because of a theory called the Equipartition Theory, it shows that heat put in to one vibrational mode will spread itself across all other ways the molecule can move and jiggle. It will also spread to nearby molecules via heat conduction.

So as long as non-ionizing radiation is putting in less heat to a molecule than is able to drain away via conduction, nothing bad will happen. The problem is that we use devices that put in more heat than can be drained, like MRI machines, so we have to limit how many hours a day you can be in one to prevent internal overheating and burns/cooking.

But many body parts are very temperature sensitive, where a few degrees can make a difference, and perhaps degrade proteins that can't handle the slightly higher temperature. Like how your body works when you have the flu and your body temp goes up to help break down invader proteins and molecules that can't handle the high temperatures.

So there's a lot to consider, and it's far from an open-and-shut thing. But I don't think 5G is like a health crisis any more than 4G or wifi was. But perhaps I am wrong, I don't know much about the frequencies being used for 5G.