CREATE TABLE table_69619 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Points" FLOAT)

Name the total number of years for chassis of maserati 250f and points less than 0
SELECT COUNT("Year") FROM table_69619 WHERE "Chassis" = 'maserati 250f' AND "Points" < '0'
SELECT COUNT("Year") FROM "table_69619" WHERE "Chassis" = 'maserati 250f' AND "Points" < '0'