FX will air a 300-hour, 600-episode Simpsons marathon this fall

Back in 2014, FXX aired its very successful Simpsons marathon and now this year, FX is looking to beat that record, airing 600 episodes of the sitcom back-to-back leading up to Thanksgiving.

The new marathon will mark the longest marathon in television history, according to FX, and will surpassed FXX’s event in 2014 in which 522 episodes aired. The marathon will also include some of the newest episodes from the show’s 28th season, which is set to premiere on Fox on Sept. 25 at 8 p.m. ET.

This season will mark the first time The Simpsons ever runs an hour-long episode, featuring a variety of comedic talent including Key and Peele’s Keegan-Michael Key and Empire’s Taraji P. Henson. Earlier this year, co-creator and showrunner Al Jean said he didn’t imagine the show going past 30 seasons, although Fox hasn’t commented on whether it will end the show at that point. The Simpsons still brings in pretty decent numbers for the network and has become one of the longest running half-hour programs in television history.

The marathon will kick off on Nov. 24 at 12 p.m. ET and will end on Dec. 6 at midnight. Every episode from the past 27 seasons will air within this time, in chronological order, according to the network.