user: ### NOW ANSWER:
Question: What is number 21's highest time?
Columns: ['Number', 'Time', 'Aircraft', 'Opponent', 'Location']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 1810.0, 'Nieuport', 'Pfalz D.III', 'Baussant']
SQL:

assistant: SELECT MAX("Time") FROM "Table" WHERE "Number" = 21.0;