To qualify for the ballot, 1.5 million valid signatures must be submitted to the California Secretary of State by Feb. 13. Don't wait until the last minute, if you turn them in locally there still needs to be time to get to the Secretary of State.
The goal is to collect two million signatures since the organizers think the signatures will be subject to close scrutiny and as with any ballot proposition, they expect some signatures to be found invalid.
If you signed a petition that had more than three spaces for signatures you must sign another petition that has only three signatures per page. Otherwise your signature will not count.