Did the bathyscaphe stay under water long on its first dive?

The bathyscaphe, specifically the Trieste, did not stay underwater long on its first dive in 1960. During this historic descent to the Challenger Deep in the Mariana Trench, it reached a depth of about 35,797 feet but only spent about 20 minutes on the ocean floor before ascending. The dive was significant for its depth but brief in duration.