In episodes aired in 2009, how many of them are credited to Sam Im for additional timer?
in 2009 refers to air_date LIKE '2009%'; credited refers to credited = 'true'; Sam Im refers to person = 'Sam Im'; for additional timer refers to role = 'additional timer'
SELECT COUNT(*) FROM Episode AS T1 INNER JOIN Credit AS T2 ON T1.episode_id = T2.episode_id WHERE T2.credited = 'true' AND T2.person = 'Sam Im' AND SUBSTR(T1.air_date, 1, 4) = '2009' AND T2.role = 'additional timer';