The longest officially released song in the world is The Rise and Fall of Bossanova. This song was made by PC III and was released on November 1st, 2016. The song is a whole 13 hours 23 minutes and 32 seconds long.
While a portion of the song is above in the Youtube video, the whole song can be found on Spotify which is divided up into several sections. Y'know...just in case carona made you officially go made.