The typical duration of the cockpit voice recorder is two hours.

1957 by David Warren

The Black Box is a small orange coloured box situated in the cockpit of the plane. It has two components. They are Flight data recorder and Cockpit Voice recorder.

There are two types of black boxes aka flight recorder, the flight data recorder (FDR) and the cockpit voice recorder (CVR).

David Warren is most known for his inventions for the airline industry. He invented the flight data recorder and also the cockpit voice recorder.