Listen to How Long Has This Been Going On? (Instrumental Reprise) online. How Long Has This Been Going On? (Instrumental Reprise) is an English language song and is sung by Fred Astaire and Audrey Hepburn. How Long Has This Been Going On? (Instrumental Reprise), from the album Funny Face [Bonus Track Version], was released in the year 2016. The duration of the song is 1:10. Download English songs online from JioSaavn.