Task: Text to Code
Input (English): SQL: SELECT Sum ( T2.lesson_time ) FROM Customers AS T1 JOIN Lessons AS T2 ON T1.customer_id = T2.customer_id WHERE T1.first_name = "Janessa" AND T1.last_name = "Sawayn"
Feedback: Replace customers table with staff table .
Output (English): SELECT sum(lesson_time) FROM Lessons AS T1 JOIN Staff AS T2 ON T1.staff_id = T2.staff_id WHERE T2.first_name = "Janessa" AND T2.last_name = "Sawayn"