CREATE TABLE table_8491 ("Name" TEXT, "Team" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT, "Points" FLOAT)

When did grid 8 finish?
SELECT "Time/Retired" FROM table_8491 WHERE "Grid" = '8'
SELECT "Time/Retired" FROM "table_8491" WHERE "Grid" = '8'