After the show at the Orpheum, I need to head back to SFO on the Bart - does anyone know what time Hamilton show is over and advice on catching BART after the show?

Yes, walk out of the theater front door and straight down the stairs to Bart. There you are at Bart.

The run time is 2 hours 45 minutes including intermission. BART runs every 20 minutes or so in the late evening and the station is right at the Orpheum so you shouldn't have any problems. Enjoy the show!

I'd check the website for the end time. The theater isn't far from the Civic center stop and the Bart stops running at 1230am I believe. You should have more than enough time to get to the airport after.