I'd love to take a bullet train from SF to LA. I make the trip every two or three months for work and just hoping on a train and zoning out would be far nicer than running through buses/light rail/airport security/cramped airplane/etc.

Distance would be pretty similar to the Tokyo to Osaka leg of the Tokaido shinkansen. Total time would probably be similar. I left my apartment 3.5 hours before I arrive in SoCal. Hour and a half on public transit, 30 minute buffer for flight, 30 minute boarding time, 60 minute flight.