How long is the total lesson time taught by staff with first name as Janessa and last name as Sawayn?
CREATE TABLE Staff (
    staff_id VARCHAR,
    first_name VARCHAR,
    last_name VARCHAR
)

CREATE TABLE Lessons (
    staff_id VARCHAR
)
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"
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How long is the total lesson time taught by staff with first name as Janessa and last name as Sawayn? ### Input: CREATE TABLE Staff (
    staff_id VARCHAR,
    first_name VARCHAR,
    last_name VARCHAR
)

CREATE TABLE Lessons (
    staff_id VARCHAR
) ### Response: 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"