user: Question: What is the lowest number of Laps that have a Time of +24.440, and a Grid higher than 18?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Simone Corsi', 'Aprilia', 20.0, '39:59.020', 8.0]
SQL:

assistant: SELECT MIN("Laps") FROM "Table" WHERE "Time" = '+24.440' AND "Grid" > 18.0;