I don't understand how long is the turnaround for a TV series. But there is this. Maybe somebody with more experience with Television production timelines...

https://www.hollywoodreporter.com/movies/movie-news/brandon-sandersons-mistborn-stormlight-archive-movie-tv-1236487271/

Brandon Sanderson’s Literary Fantasy Universe ‘Cosmere’ Picked Up by Apple TV (Exclusive)

Brandon Sanderson's 'Mistborn' series and 'The Stormlight Archive' are being eyed for film and television adaptation at Apple.

@JussiVilleHeiskanen I’d say save your mana. established tv shows take 2-3 years between seasons now, and there’s only 11 months to go from initial idea to released episode 1. My prediction is 2028 or 2029 for these projects

Hmmm. Unless there's something already in development (definitely possible) it's sort of a tight turnaround to make the deadline, assuming it's another prestige series or movie (which it presumably would be given the popularity of his books).

@AndrewHartman Each of the Harry Potter films were created in less time.

Does the first or last episode of the season need to be released before 2027?

@LukeHanks Thank you for the question. Description changed.

Would this include the Wheel of Time books co-authored by Sanderson, if Amazon incorporates material from those in the WoT TV series by then?

@NLeseul Yes, if a season based at least partially on one of the books 12-14 in the series is released before 2027.