I dump sprues, culls, and ingots into the remaining liquid until it is "quenched", might as well use the heat for something useful and the pot cools off much more quickly so I don't have to worry about unattended dripping accidents.
Many years ago a member on another forum lost his whole casting/reloading building due to a bottom dripper being left unattended while heating up. He lost a LOT of stuff. That always stuck with me, especially since my casting setup is in my house.