An interesting offshoot of this type of question is: how long does it take to hit every stop on a given transit system? BART has quite a few people making attempts; the official BART website even maintains a little article [1]! A couple have made videos of attempts and theory [2, 3], but the king of these things is tomo tawa linja, who I believe is the current record holder at 5:30:26 [4].
[1] https://www.bart.gov/news/fun/speedrun
[2] https://www.youtube.com/watch?v=6o9JGsamQF0