user: Question: What is the highest number of laps with a time of +6.643 and grid less than 2?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Mattia Pasini', 'Aprilia', 22.0, '38:58.171', 1.0]
SQL:

assistant: SELECT MAX("Laps") FROM "Table" WHERE "Time/Retired" = '+6.643' AND "Grid" < 2.0;