At this point, it almost feels like you could say the only sure things in the world are death, taxes, and The Simpsons. The show, now in its 27th season, has held the record for longest-running scripted primetime series for six years. It’s been on so long that adults with houses and children literally have not seen a time in their lives when The Simpsons wasn’t a thing.

Like everything, though, the show will eventually end, and while we always assumed its ending would coincide with the day the sun finally supernovas and engulfs our planet in a cosmic inferno, that is apparently not the case. At the moment, the show’s cast is signed on for 28 seasons with an option for up to 30. That means there’s a good chance that, at the end of season 28, Fox won’t have to go back to the negotiating table with the cast and can just push the order right up to three decades. Beyond that, there’s less certainty. So, is 30 seasons the cap for The Simpsons? According to an interview with showrunner Al Jean, it may very well be.

“I wouldn’t be stunned if we stopped at 28, but my bet is on at least 30. But then you’d have to resign them again. If you made me pick one, I’d say the likeliest is ending after 30, but I’ve been wrong before. I thought five seasons was good when I got there (laughs).”

So, while it’s not a sure thing, the guy that’s been at the helm of The Simpsons since 2001 (and helped run it before that) thinks 30 seasons is the likely limit. Make your 2019 Ultimate Simpsons Marathon calculations accordingly.