BART runs with 20 minute headways on longer routes (and as little as 4 minutes through San Francisco). The six CalTrain "baby bullet" express trains run hourly at best, with long service lapses mid-day and in the late evenings. Locals run more often (about every 10--20 minutes during peak commute hours) but add a half-hour to the just over one-hour express schedule.
(Both are still faster by far than driving, particularly during rush hour.)
BART's Green Line (Daly City - Beryessa / North San Jose) departs every 20 minutes from 4:55 am though 7:36 pm (southbound) and 4:59 am through 6:49 pm (northbound):
(Both are still faster by far than driving, particularly during rush hour.)
CalTrain: <https://www.caltrain.com/media/22502/download>
BART's Green Line (Daly City - Beryessa / North San Jose) departs every 20 minutes from 4:55 am though 7:36 pm (southbound) and 4:59 am through 6:49 pm (northbound):
<https://www.bart.gov/sites/default/files/2024-01/January%201...>