Is there a time limit on copyright

Does a copyright ever expire?
The term of copyright for a particular work depends on several factors, including whether it has been published, and, if so, the date of first publication.
As a general rule, for works created after January 1, 1978, copyright protection lasts for the life of the author plus an additional 70 years..
What is the longest held copyright?
It looks likely, therefore, that the 1753 Adams diary is both the oldest work in the US still protected by copyright and also the work whose Federal copyright protection will expire the longest after creation: in this case, over three centuries..
What is the longest lasting copyright?
Since it was published in 1966, no renewal of copyright was needed; the 1753 diary is protected until 2062 (1966 + 95), for a total of 309 years of protection..
What is the shortest time for copyright to last?
Under the Convention, the duration of copyright depends on the length of the author's life.
Berne specifies that copyright exists a minimum of 50 years after the author's death, while a number of countries, including the European Union and the United States, have extended that to 70 years after the author's death..
From the beginning, copyright laws have sought to balance authors' rights with the benefit to the public of the free exchange of ideas and cultural expression, and this has always been done by limiting the duration of copyright.
Since it was published in 1966, no renewal of copyright was needed; the 1753 diary is protected until 2062 (1966 + 95), for a total of 309 years of protection.

Copyright generally lasts 70 years after the death of the creator or after the first year of publication, depending on the type of material and/or when it was first published: Artistic works, including photographs. Dramatic works.

What is the minimum term for copyright protection?

The Berne Convention stipulates that the duration of the term for copyright protection is the life of the author plus at least 50 years after their death.
For some categories of works, the minimum duration is shorter:

for example

the minimum term for applied art is 25 years

movies have a minimum term of 50 years.

1967 single by Procol Harum

A Whiter Shade of Pale is a song by the English rock band Procol Harum that was issued as their debut record on 12 May 1967.
The single reached number 1 in the UK Singles Chart on 8 June and stayed there for six weeks.
Without much promotion, it reached number 5 on the US Billboard Hot 100.
One of the anthems of the 1967 Summer of Love, it is one of the most commercially successful singles in history, having sold more than 10 million copies worldwide.
In the years since, A Whiter Shade of Pale has become an enduring classic, with more than 1,000 known cover versions by other artists.

Obligatory feature in a genre

A scène à faire is a scene in a book or film which is almost obligatory for a book or film in that genre.
In the U.S. it also refers to a principle in copyright law in which certain elements of a creative work are held to be not protected when they are mandated by or customary to the genre.

Is there a time limit on copyright

Does a copyright ever expire?

What is the longest held copyright?

What is the longest lasting copyright?

What is the shortest time for copyright to last?

What is the minimum term for copyright protection?