It depends on what you're used to. SF to San Jose, unless you live next to a station at one end and the place you're trying to go is next to a station at the ot

It depends on what you're used to. SF to San Jose, unless you live next to a station at one end and the place you're trying to go is next to a station at the other I'd expect 2 to 2.5 hrs one way. A quick search shows SF to SJ to be 1hr to 1hr 23 mins but then you'll likely need 20-30 mins at each end to get where you're going.