If your asking for a basic time frame I can give it a shot
I thaw my smaller rats and mice under running water. 3 adult mice in a baggie take about 10 minutes in hot water to thaw. An XL rat takes about 30-45 minutes till you can no longer feel the coolness and even then I let it soak until I feel its warm enough. Since balls rely on their heat pits to pick up the food trace as well as scent, I would recomend thawing in a baggie in HOT water in the sink. That way the smell is strong enough and the ball can pick up a strong heat source.