How long does a necessity easement last?

A necessity easement is established to allow access to a landlocked property, providing essential rights for a property owner who has no other means of access. The duration of a necessity easement is valid as long as the necessity for it continues to exist. Once the reason for the easement is removed—such as if the landlocked property gains access to a public road—the easement can become void.

This makes the correct answer focused on the ongoing requirement for the easement. As soon as that necessity is no longer present, there is no longer a reason for the easement to continue, thus it does not last indefinitely or until property ownership changes. It also does not operate on a fixed statutory time limit. Rather, it is directly tied to the circumstance that created it, ensuring that it serves its intended purpose while that purpose remains relevant.