user: Question: What was the retired time for someone who was on grid 18?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Michael Schumacher', 'Ferrari', '70', '1:33:36.111', '2']
SQL:

assistant: SELECT "Time/Retired" FROM "Table" WHERE "Grid" = '18';