What is the runtime of the movie starred by Jackie Chan with a rating greater than 7?
starred by Jackie Chan refers to Name = 'Jackie Chan'; rating greater than 7 refers to Rating > 7
SELECT T1.Runtime FROM movie AS T1 INNER JOIN characters AS T2 ON T1.MovieID = T2.MovieID INNER JOIN actor AS T3 ON T3.ActorID = T2.ActorID WHERE T3.Name = 'Jackie Chan' AND T1.Rating > 7