I agree with the rest of you; there are too many variables involved to give a meaningful answer.
Some of the public school terps here in South Carolina get $12/hr, 40-hr week, 180 days per year.
Basic community interpreting pays more per hour but there's no guarantee to a certain number of hours per week.
Other variables:
mileage reimbursement
drive time
two-hour minimum
certified/non-certified
evening/weekend rates
emergency rates
team rates
per diem
benefits package
annual salary v. hourly wage
staff terp v. independent contractor v. agency hire v. government agency
specialty qualifications (legal, mental health, Spanish fluency, etc.)
