Saturday Night Live is one of the most well-known television programs currently airing. With 67 Emmy awards and 260 nominations, it is certainly one of the nation's most beloved comedy series. But viewers better not get too attached to the cast, as it is always changing and evolving. Although, the sketch series has been running for 45 seasons, cast members rarely stick around for very long. According to Popsugar, Kenan Thompson, now on his 17th season, is the longest-reigning cast member by a long shot. Still, it is always a surprise when an important cast member decides to leave the series. That's why fans were shocked to hear that Colin Jost might be exiting SNL.