Question: How many seasons did the man whose name was use in Honor of Maurice "Rocket" Richard Trophy played  in the National Hockey League?
Sentence (from "Maurice Richard"): Joseph Henri Maurice "Rocket" Richard {'1': ", '2': ", '3': ", '4': "} ( ; ] ; August 4, 1921 – May 27, 2000) was a Canadian professional ice hockey player who played 18 seasons in the National Hockey League (NHL) for the Montreal Canadiens.
Relevant evidence: Yes