user: Question: How much Grid has a Time/Retired of +0.785, and Laps larger than 29?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Stefano Perugini', 'Aprilia', 29.0, '44:46.542', 4.0]
SQL:

assistant: SELECT SUM("Grid") FROM "Table" WHERE "Time/Retired" = '+0.785' AND "Laps" > 29.0;