It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article, nor is it one of Wikipedia's policies or guidelines, as it has not been thoroughly vetted by the community. Some essays represent widespread norms; others only represent minority viewpoints.
This page in a nutshell: Timescales that may affect content in Wikipedia.
Timescales that may affect content in Wikipedia come from external and internal factors:
^The actual term depends on several factors. In this hypothetical example an author creates their works at age 35 and lives for 80 years (human life expectancy), for actual details see WP:COPYOTHERS and Expansion of U.S. copyright term. This worked example shows how the term varies over time for an author that creates their work at age 35 and lives for 70 years.