What was the Western television show that on for twenty years had john Wayne in it?

There was no Western television show that ran for twenty years with John Wayne in it.

John Wayne was primarily a film star, and while he did make some appearances in television shows, he never starred in a series. His film career spanned decades, and he was known for his iconic roles in Westerns like "Stagecoach," "The Searchers," and "The Man Who Shot Liberty Valance."