It's been 7 days. He has three more days to decide, I believe.
This is a bit scary, as from what I understand, if the governor fails to sign it, it still becomes law in California.
From here: Bill Signing Deadlines - StateScape
The governor must sign or veto legislation within 12 days of the day of transmittal, or it becomes law without his/her signature. However, if the 12th day is a Sunday or a holiday, the governor has until the next working day to act.