Assuming you got the ticket in LA County.
http://www.lasuperiorcourt.org/
You could browse for more info. throught it was 60 days after the judge let you do the traffic school, but the website says 64 days. 4 days would be time any online/offline traffic school sends the certificate to the court.
I called the customer servicd to experdite, $40 more the rep told me it is not necessary since completion dated in marked on than certificate.
I'd play safe get it done ASAP. Good luck.