Originally Posted by Cregar
I was thinking about still using the bathtub because I would benefit from the cold water on the outside of the pot along with the ice water running through the chiller.
A better idea would be to stir your wort while the chiller is in it. It's best if you stir in the opposite direction of the flow of water in your chiller coil. This creates a cross current heat exchange that is highly efficient.
When I chill using this method, it takes between 12-17 minutes to chill my wort to 70 degrees. Also, I only end up using 1 large bag of ice.