Hi everybody, I have read a lot of threads concerning the correct way to check the coolant level (concerning temp) and I have come to the conclusion that the most proper way is to check the coolant level after 1 day of car sitting when the temp of the coolant is at the very low.

However, I would like to ask home many hours a car should be sitting in order that the coolant temp will be at the very low? Does it need 12 hours for this task?

Thanks