Question: How long is the total lesson time took by customer with first name Rylan and last name Goodwin?
SQL: SELECT sum ( T1.lesson_time )  FROM Lessons AS T1 JOIN Customers AS T2 ON T1.customer_id   =  T2.customer_id WHERE T2.first_name  =  "Rylan" AND T2.last_name  =  "Goodwin"