How often does the refrigerator thermostat change to know whether it is good or bad?

10 minutes. The refrigerator thermostat is tested by the manufacturer, and it takes 10 minutes to know whether it is good or bad. The refrigerator thermostat automatically controls the start and stop of the refrigeration compressor within a certain temperature difference range according to the temperature requirements of the refrigerator, so as to keep the temperature in the refrigerator within a given value range.