CREATE TABLE table_20466963_4 (date VARCHAR2, guest_4 VARCHAR2)

How many dates are associated with a guest 4 being Jim Jeffries (debut)?
SELECT COUNT(date) FROM table_20466963_4 WHERE guest_4 = "Jim Jeffries (debut)"
SELECT COUNT("date") FROM "table_20466963_4" WHERE "Jim Jeffries (debut)" = "guest_4"