For a few months. The post office will do it for anyone for a few months, but then they stop forwarding mail. Maybe businesses get that treatment longer, but when people move they only get a few months.

Standard mail forwarding is one year, and you can extend that for an additional 18 months. I don't know of any reasonable person who would call that "a few months"

Standard US Mail forwarding is 12 months and may be extended for a further 18 months.