Wikipedia:No cite-by date
 | This is an essay on verifiability. 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. |
Maintenance tags like {{citation needed}} do not expire. When a statement in an article requires citation, the length of time for which it has been uncited is not a criterion for the statement's removal whatsoever.
With that said, the presence of long-uncited statements is often linked to other problems that do merit a summary deletion, such as the statement being original research, or its being undue within a given article. Clarity of purpose and communication thereof is preferable to simply noting the age of an uncited statement.