Peremptory challenge (CCP 170.6) to discovery referee appointed for all discovery purposes: 10 days after notice of appointment

(b) In a discovery matter, a motion to disqualify an appointed referee pursuant to Section 170.6 shall be made to the court by a party either: (A) Within 10 days after notice of the appointment, or if the party has not yet appeared in the action, a motion shall be made within 10 days after the appearance, if a discovery referee has been appointed for all discovery purposes. (B) At least five days before the date set for hearing, if the referee assigned is known at least 10 days before the date set for hearing and the discovery referee has been assigned only for limited discovery purposes.

CCP 12: "The time in which any act provided by law is to be done is computed by excluding the first day, and including the last, unless the last day is a holiday, and then it is also excluded." CCP 12a(a): "If the last day for the performance of any act provided or required by law to be performed within a specified period of time is a holiday, then that period is hereby extended to and including the next day that is not a holiday. For purposes of this section, “holiday” means all day on Saturdays, all holidays specified in Section 135 and, to the extent provided in Section 12b, all days that by terms of Section 12b are required to be considered as holidays." CCP 12b: "If any city, county, state, or public office, other than a branch office, is closed for the whole of any day, insofar as the business of that office is concerned, that day shall be considered as a holiday for the purposes of computing time under Sections 12 and 12a." CCP 10: "Holidays within the meaning of this code are every Sunday and any other days that are specified or provided for as judicial holidays in Section 135."