The personal representative shall either petition for an order for final distribution of the estate or make a report of status of administration not later than the following times:
(a) In an estate for which a federal estate tax return is not required, within one year after the date of issuance of letters.
(b) In an estate for which a federal estate tax return is required, within 18 months after the date of issuance of letters.
(Enacted by Stats. 1990, Ch. 79.)