user: Question: What is the highest laps with a 30 finish?
Columns: ['Year', 'Start', 'Qual', 'Rank', 'Finish', 'Laps']
Types: ['text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['1958', '16', '142.744', '24', '30', 0.0]
SQL:

assistant: SELECT MAX("Laps") FROM "Table" WHERE "Finish" = '30';