After the filing in the Clerk's office of a Release of Mortgage, when does the Trustee duties extinguish?

The trustee of a deed of trust has only two duties. To reconvey the property to the trustor upon satisfaction of the promissory note or to convey the property to the buyer upon the trustor's default and trustee's sale. When you received your deed of reconveyance and the release was recorded, the trustee's powers and duties ended.