CREATE TABLE table_56208 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

In grid 15, how many laps were there before ending with a time of exhaust?
SELECT SUM("Laps") FROM table_56208 WHERE "Time/Retired" = 'exhaust' AND "Grid" < '15'
SELECT SUM("Laps") FROM "table_56208" WHERE "Grid" < '15' AND "Time/Retired" = 'exhaust'