California Code, Probate Code - PROB § 10302

(a) If it is shown that it will be to the advantage of the estate, the court or judge may by order shorten the time of notice of sale to not less than five days.

(b) Except as provided in subdivision (c), if the court or judge makes an order under subdivision (a), notice of sale shall be published as provided in Section 10300 except that the publication shall be pursuant to Section 6061 of the Government Code.

(c) In a case described in Section 10301, if the court makes an order under subdivision (a), notice of sale shall be posted as provided in Section 10301 except that the notice of sale shall be posted at least five days before the sale instead of 15 days as required by Section 10301.