user: Question: How many dates are associated with a guest 4 being Jim Jeffries (debut)?
Columns: ['Date', 'Presenter', 'Guest 1', 'Guest 2', 'Guest 3', 'Guest 4']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2 September', 'Colin Murray', 'Eleanor Oldroyd', 'Bobby Gould', 'Bob Mills', 'Martin Kelner']
SQL:

assistant: SELECT COUNT("Date") FROM "Table" WHERE "Guest 4" = 'Jim Jeffries (debut)';