What is the law in California on how quickly a company can work you after a full day of work?

There must be some law on this. Otherwise a company for example can work you from 12pm until 11pm, and then tell you, they need you to come back to work at 2am, and let's say it takes you almost an hour to get home. You wouldn't get much sleep.

I found a copy of the California Labor Code. The answer you are looking for is in Division 2, Part 2 "Working Hours".

http://www.leginfo.ca.gov/cgi-bin/calawquery?codesection=lab&codebody=