How much time do businesses in El Mirage City, AZ State operate in average daily?
how much time does this business open refers to SUBTRACT(closing_time, opening_time); DIVIDE(SUM(SUBTRACT(closing_time, opening_time)), SUM(Business.business_id))
SELECT SUM(T2.closing_time - T2.opening_time) FROM Business AS T1 INNER JOIN Business_Hours AS T2 ON T1.business_id = T2.business_id WHERE T1.city = 'El Mirage' AND T1.state = 'AZ'