CREATE TABLE table_53539 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/retired" TEXT, "Grid" FLOAT)

what is the time/retired when the driver is toulo de graffenried?
SELECT "Time/retired" FROM table_53539 WHERE "Driver" = 'toulo de graffenried'
SELECT "Time/retired" FROM "table_53539" WHERE "Driver" = 'toulo de graffenried'