How many laps were there when time/retired was gearbox?
CREATE TABLE table_51481 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT SUM("Laps") FROM table_51481 WHERE "Time/Retired" = 'gearbox'
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 many laps were there when time/retired was gearbox? ### Input: CREATE TABLE table_51481 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT SUM("Laps") FROM table_51481 WHERE "Time/Retired" = 'gearbox'