Comment by maxbond
https://en.wikipedia.org/wiki/Character_limit#On_Twitter
> In November 2017, Twitter increased its character limit from 140 to 280 characters. In 2023, Twitter boosted the character limit for Twitter Blue subscribers. In February, it was increased to 4000. In April, it was again increased to 10,000, and in June, to 25,000.
The character limit is just whatever the longest tweet Musk wants to send.