CREATE TABLE table_61708 ("Pos." TEXT, "Class" TEXT, "Entrant" TEXT, "Drivers" TEXT, "Laps" FLOAT)

What were the highest laps for glenn seton gregg hansford?
SELECT MAX("Laps") FROM table_61708 WHERE "Drivers" = 'glenn seton gregg hansford'
SELECT MAX("Laps") FROM "table_61708" WHERE "Drivers" = 'glenn seton gregg hansford'