Time Flies is a single from Porcupine Tree's 2009 studio album The Incident. Written by bandleader Steven Wilson, "Time Flies" is the centrepiece of the 55 minute movement that comprises the first disc of the album. The track deals with the passage of time and the phenomenon that as one gets older, time seems to pass even more quickly, with the lyrics making reference to Wilson's life so far. The song was edited down from its album length of 11:40 for both the single and video releases. The music video was directed by longtime Porcupine Tree collaborator Lasse Hoile. Due to an error in the mixing stage, the promo CD single edit has a strange drum mix, making it different from the full-length album mix.