I know that it's not a bass, but I recently caught a catfish that I planned to keep and cook. So I threw it in a cooler on top of a bag of ice. 20 minutes later I looked in the cooler and the thing was still alive. So I decided it put it back in the water and let it swim away.
So I am not sure how long bass can live out of the water, but a catfish can live quite a while.