Is the answer: “2027 is sounding like a safe bet for 3 Body Problem Season 2.” ?
From the Article:
In Cixin Liu’s epic science fiction novel trilogy — which begins with The Three-Body Problem — it takes 400 years for the invading Trisolorian fleet to come to Earth. It won’t take that long for the next season of 3 Body Problem to hit Netflix, but it still might feel longer than expected. While it’s very encouraging that showrunners David Benioff, D.B Weiss, and Alexander Woo have gotten the green light to finish adapting the rest of the story, it does sound like we may all need to get used to waiting. Like the long game in the novel, a devotion to the Netflix version of 3 Body Problem will require a lot of patience.