user: Question: What is the total number of laps where time/retired is +2 Laps and the grid number is bigger than 18?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Rubens Barrichello', 'Ferrari', 60.0, '1:28:37.554', 1.0]
SQL:

assistant: SELECT SUM("Laps") FROM "Table" WHERE "Time/Retired" = '+2 Laps' AND "Grid" > 18.0;