Trust account or report with 16461(c) notice: beneficiary must deliver written objection to trustee within 180 days (or longer trust period) after receipt

(c) Subject to subdivision (b), a provision in a trust instrument that releases the trustee from liability if a beneficiary fails to object to an item in an interim or final account or other written report within a specified time period is effective only if all of the following conditions are met: (1) The account or report sets forth the item. (2) The period specified in the trust instrument for the beneficiary to object is not less than 180 days, or the trustee elects to follow the procedure provided in subdivision (d). ... (g) Provided that a beneficiary has filed a written objection to an account or report that complies with the requirements of subdivision (c) within the specified, valid period, a supplemental written objection may be delivered in the same manner as the objection not later than 180 days after the receipt of the account or report or no later than the period specified in the trust instrument, whichever is longer.

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." CCP 17(b)(4): "“Month” means a calendar month, unless otherwise expressed." Prob. Code 1000(a): "Except to the extent that this code provides applicable rules, the rules of practice applicable to civil actions, including discovery proceedings and proceedings under Title 3a (commencing with Section 391) of Part 2 of the Code of Civil Procedure, apply to, and constitute the rules of practice in, proceedings under this code."