Final answer:
Periodicals are generally forwarded for 60 to 120 days if undeliverable as addressed, but this can vary by postal service and specific instructions from the sender.
Step-by-step explanation:
Periodicals such as magazines and newspapers are usually subject to mailing regulations for forwarding if they are undeliverable as addressed. Forwarding of periodicals typically varies by the postal service of the country in question. In general, for domestic deliveries, postal services may forward periodicals for a limited time, often between 60 to 120 days depending on the service used and the sender's instructions.
However, if periodicals are undeliverable, most newspapers will list them as such only once per week. This is relevant when considering that homes for sale may appear randomly, and the delivery of periodicals to such addresses may be discontinued or altered once a home changes ownership or when the postal service cannot identify a current resident.