CREATE TABLE table_61367 ("Number" FLOAT, "Time" FLOAT, "Aircraft" TEXT, "Opponent" TEXT, "Location" TEXT)

What number is in Bois de Warville with a time less than 810?
SELECT SUM("Number") FROM table_61367 WHERE "Location" = 'bois de warville' AND "Time" < '810'
SELECT SUM("Number") FROM "table_61367" WHERE "Location" = 'bois de warville' AND "Time" < '810'