CREATE TABLE table_204_668 (id DECIMAL, "#" DECIMAL, "menteri besar" TEXT, "took office" TEXT, "left office" TEXT, "party" TEXT)

how many years was jaafar mohamed in office ?
SELECT "left office" - "took office" FROM table_204_668 WHERE "menteri besar" = 'jaafar mohamed'
SELECT "left office" - "took office" FROM "table_204_668" WHERE "menteri besar" = 'jaafar mohamed'