How long can USPS hold mail?
Not less than 3 days and not more than 30, under DMM 508.11.1.1. USPS points customers who need a longer pause toward a forwarding service instead, since forwarding has no equivalent ceiling on it.
Are packages held along with letters?
DMM 508.11 describes the service as covering all mail, including accountable mail, held at the Post Office for an eligible address. USPS does not publish a parcel-by-parcel breakdown on its consumer page, so if one specific shipment matters a great deal, confirm it with the destination Post Office rather than assuming.
What happens at the end of a hold?
Accumulated mail, including accountable mail, has to be picked up within 10 days of the end date. DMM 508.11.4 states that anything not collected inside that window will be returned to the sender or securely destructed, which is the rule that turns somebody else's holiday into your problem.
Can I stop a parcel I already sent to an address on hold?
Not through us. Once a label is bought and scanned the shipment belongs to the carrier network, and the two things that actually work are the carrier's own delivery instruction tools and a direct message asking the recipient to collect before the ten day window runs out.