Nick Offerman and Megan Mullally – 17 years

Let’s just start off by saying that this couple recently wrote a book together, titled The Greatest Love Story Ever Told. If that doesn’t show you the type of relationship they have, maybe the fact that Parks and Recreation star Nick Offerman and fellow actress Megan Mullally have been together for nearly 20 years will give you a hint.

Mullally is known for her acting in the series Will & Grace, while Offerman is recognized for his role as Ron Swanson from Parks and Rec. Their secret to a successful marriage? Nick and Megan refuse to be apart any longer than two weeks at a time.