The query "how long is" is incomplete by itself, but based on search results it could relate to several meanings. If referring to the song "How Long" by Charlie Puth, it is 3 minutes and 18 seconds long.
If referring to the song "How Long" by Ace, the length is not specifically stated in the clip but it is their debut single from 1974.
If the query means "how long" as a phrase asking for duration or time span, it is a common English question phrase used for asking about amounts of time.
If the interest is about how long a film is shown in a cinema called Kinepolis, it varies and depends on the movie's success and public interest, and can differ cinema by cinema.
Please specify the full context or subject for a precise answer on "how long is".
