A fast leak would be one you could hear, a small leak could take a good while [months] before the freon would be low enough to cause problems. It can be from 1 day to many years depends on how small/slow the leak is. some leak only occurs while the system is running due to high pressure.2012-06-07
Does Freon dissipate over time?
Freon (which is really just a particular brand of refrigerant) lasts forever. It's not like gas in car; it does not get “used up.” You see, your air conditioner's refrigerant system is a “closed/sealed system,” meaning that it does not allow refrigerant to escape in any way.
Does Freon leak when AC is off?
Does Freon leak when AC is off? Many homeowners wonder whether they can still use their air conditioners if the level of Freon in their unit is depleted. And the answer is: yes, your AC can function with a Freon leak.2019-06-27