California Code, Education Code - EDC § 87410

Any academic employee not a regular employee who fails to signify his acceptance within 45 consecutive calendar days after notice of his or her election or employment has been given him or her, or mailed to him or her by United States registered mail with postage thereon prepaid at his or her last known place of address, by the clerk or secretary of the governing board of the community college district, shall be deemed to have declined the employment.