Duty to account.) (a) Except as provided in subsection (b), within 60 days after the expiration of 12 months after the issuance of letters or within such further time as the court allows and thereafter whenever required by the court until the administration is completed, and if the letters are revoked, within such time as the court directs, every representative of a decedent‘s estate shall prepare and present a verified account of his administration to the court which issued his letters. The account shall state the receipts and disbursements of the representative since his last accounting and all real and personal estate which is on hand and shall be accompanied by such evidence of the disbursements as the court may require.
     (b) If written consents of all interested persons are filed in the court, the court may excuse the preparation and presentation of an account, subject to such conditions as the court deems appropriate.