If you’re looking to join the completists who claim to have watched every episode of The Simpsons at least once, then you best prepare yourself for Aug. 21, 2014.

That’s when FXX will start a marathon that airs all 25 seasons of The Simpsons in chronological order — with The Simpsons Movie airing after episode 400, then resuming until all 552 episodes have aired. That’ll conclude at midnight Sept. 1. Twelve straight, continuous days and nights of Homer, Marge, Bart, Lisa, Maggie and the rest of Springfield.

It’s all to celebrate FXX’s acquisition of the record-setting animated TV series.

Because if you thought finding repeats of The Simpsons on the regular dial wasn’t easy enough, now you’ll have an exclusive cable TV home for it nightly as of Sept. 2, 2014.

Plus a new website coming in October — FXX’s “Simpsons World” (SimpsonsWorld.com) will offer instant and on-demand access to every episode ever via the site, FXNOW apps, Xbox One, Xbox 360, Android phones and tablets, Smart TVs, and additional set-top devices. The site also will give users interactivity with the mythical Springfield.

At 25 seasons and counting, The Simpsons ranks as the longest-running scripted show in television history, has won 28 Emmy® Awards, received an Academy Award® nomination in 2012 for the theatrical short “The Longest Daycare,” a virtual coaster ride at Universal Studios, a star on The Hollywood Walk of Fame and five U.S. postal stamps personally designed by creator Matt Groening.

The Simpsons is a Gracie Films Production in association with 20th Century Fox Television. James L. Brooks, Matt Groening and Al Jean are the executive producers. Film Roman, a Starz Media Company, is the animation house.