How many dates are associated with a guest 4 being Jim Jeffries (debut)?
CREATE TABLE "season_2006_07" (
  "date" text,
  "presenter" text,
  "guest_1" text,
  "guest_2" text,
  "guest_3" text,
  "guest_4" text
);
SELECT COUNT("date") FROM "season_2006_07" WHERE "guest_4"='Jim Jeffries (debut)';