California Code, Probate Code - PROB § 10255

(a) A private sale of personal property may not be made before the day stated in the notice of sale as the day on or after which the sale will be made, nor later than one year after that day.

(b) In the case of a private sale of personal property, the bids or offers shall be in writing and shall be left at the place designated in the notice of sale, or be delivered to the personal representative personally or to the person specified in the notice of sale, at any time after the first publication or posting of notice of sale and before the making of the sale.