A two-hour minimum is an industry standard and set forth by the Registry of Interpreters for the Deaf as a practice for Independent contractors. Since our agency subcontracts all of our Interpreting assignments with independent contractors, we also charge a two-hour minimum. Also, Interpreters work multiple places over the span of a day and much of their time is spent driving from one assignment to another. The two-hour minimum helps to compensate them for their travel to and from assignments in the Phoenix Metro Area.