CREATE TABLE table_204_108 (id DECIMAL, "typ" TEXT, "construction time" TEXT, "cylinders" TEXT, "capacity" TEXT, "power" TEXT, "top speed" TEXT)

which typ -lrb- s -rrb- had the longest construction times ?
SELECT "typ" FROM table_204_108 ORDER BY "construction time" - "construction time" DESC LIMIT 1
SELECT "typ" FROM "table_204_108" ORDER BY "construction time" - "construction time" DESC NULLS LAST LIMIT 1