Cal. Education Code § 46160

(a) (1) Notwithstanding any other law, the governing board of a school district that maintains a junior high school or high school may schedule classes in these schools so that each pupil attends classes for at least 1,200 minutes during any five-schoolday period or 2,400 minutes during any 10-schoolday period. (2) Notwithstanding any other law, the governing board of a school district that maintains an early college high school or middle college high school may schedule classes in these schools so that each pupil who satisfies subdivision (a) or (b) of Section 46146.5 attends classes for at least 900 minutes during any five-schoolday period or 1,800 minutes during any 10-schoolday period. (b) Under a schedule pursuant to subdivision (a), any pupil may be authorized to attend school for less than the total number of days in which the school is in session as long as the pupil attends the required number of minutes per five-schoolday period or per 10-schoolday period to accommodate career technical education and regional occupational center and program courses and block or other alternative school class schedules. (c) Computations authorized by this section shall not result in an increase in state apportionments to a school district.