I liked the show, but I think they figured they gave us one great moment in Myers/Kanye and decided to dog it the rest of the show.
Kevin Nealon was a featured player in 86-87. So overall he lasted 9 seasons, 8 as a cast member.
Tim Meadows was a featured player from 91-93. So he lasted 9 seasons, 7 as a castmember.
Darrell's been a castmember all 11 years.
Al Franken has also been a featured player on and off for a while.
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I don't really think being billed as a "featured player" means you don't get to count that as a year you were in the cast, provided you appeared in every show.