If you take bart to Montgomery, it's an 0.8 mile walk to South Park. Calling that a bit under 20 minutes seems fair.
So a 10 minute walk to bart, a 5 minute wait, 7 minutes on bart, 3 minutes to exit the station, and 20 minutes to South Park is your 45-ish minutes.
Source: I used to do this commute. Getting around internally in sf is absolutely terrible the second you're not super close to the transit line.
If you take bart to Montgomery, it's an 0.8 mile walk to South Park. Calling that a bit under 20 minutes seems fair.
So a 10 minute walk to bart, a 5 minute wait, 7 minutes on bart, 3 minutes to exit the station, and 20 minutes to South Park is your 45-ish minutes.
Source: I used to do this commute. Getting around internally in sf is absolutely terrible the second you're not super close to the transit line.