user: Question: What is Honda's highest grid with a time of +1:38.407?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Valentino Rossi', 'Yamaha', 22.0, '43:28.841', 2.0]
SQL:

assistant: SELECT MAX("Grid") FROM "Table" WHERE "Manufacturer" = 'Honda' AND "Time" = '+1:38.407';