At this particular moment, according to Google Maps, it would take 2hours 5min to get to SFO by a mix of bus and train, or 23min by car. Bus/Trains are cheap, but when you have more than 30 people on board you probably have to make a lot of stops that slow down the trip.

https://www.google.com/maps/dir/Googleplex,+Amphitheatre+Par...