CREATE TABLE table_68663 ("Year" FLOAT, "Team" TEXT, "Co-Drivers" TEXT, "Class" TEXT, "Laps" FLOAT, "Pos." TEXT, "Class Pos." TEXT)

Name the most laps for corvette racing in 2004
SELECT MAX("Laps") FROM table_68663 WHERE "Team" = 'corvette racing' AND "Year" = '2004'
SELECT MAX("Laps") FROM "table_68663" WHERE "Team" = 'corvette racing' AND "Year" = '2004'