California Code, Education Code - EDC § 48400

All persons 16 years of age or older and under 18 years of age, not otherwise exempted by this chapter, shall attend upon special continuation education classes maintained by the governing board of the high school district in which they reside, or by the governing board of a neighboring high school district, for not less than four 60-minute hours per week for the regularly established annual school term. Such minimum attendance requirement of four 60-minute hours per week may be satisfied by any combination of attendance upon special continuation education classes and regional occupational centers or programs.