Johnny Carson's yacht

Sad news about Johnny Carson this week--we've lost one helluva entertainer. Some of you may know that he enjoyed cruising aboard a motoryacht called Serengeti that he kept in California. I've been trying to determine the correct LOA. Years ago I wanted to do a story with him and was told Serengeti was in the 80-foot range, but some articles this week state the yacht's 130 feet. Anyone know the correct info?