Conversation so far:
When did Pete Conrad leave NASA?
Pete Conrad retired from NASA and the Navy in 1973
What did Pete Conrad do after leaving NASA?
Pete Conrad went to work for American Television and Communications Company.
What was Pete Conrad's role at the American Television and Communications Company?
Pete Conrad, as the vice president of operations and chief operating officer, was in charge of the operation of existing systems and the national development of new cable television systems.
How long did Pete Conrad have the position of vice president of operations and chief operating officer at the American Television and Communications Company?
In 1976, Pete Conrad accepted a position with McDonnell Douglas as a vice president and consultant.

Question: How long did he stay with the Douglas company?
Self-contained rewrite: How long did Pete Conrad stay with the McDonnell Douglas Company?