user: ### NOW ANSWER:
Question: What number is in bois de warville with a time less than 810?
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 SUM("Number") FROM "Table" WHERE "Location" = 'bois de warville' AND "Time" < 810.0;