Mine took 6 days to show but my license took forEVER to show up. I think it was 7 or 8 weeks or so. Some of my classmates had theirs show up online just 2 days after testing and others had to wait about 2 weeks
If you took NCLEX-PN, your license number will not appear online until after you have mailed the California BVNPT a copy of your results with a $150 check (the price may or may not have increased). Your license number will appear online soon after they cash the check.
If you took NCLEX-RN, the California BRN will post your license number within a few days to a few weeks. I know that this is a wide time frame.