Your General Delivery mail goes back to the sender after 10 days at a post office with city carrier service, or after 15 days at one without. The 30-day figure everyone quotes, ours included, is a ceiling you have to ask for. Both numbers come from the Domestic Mail Manual, which we read on 2026-08-17.
Two sections, two different jobs
The one that gets quoted is DMM 508.6.4: “Each general delivery mailpiece is held for no more than 30 days, although a shorter time period may be requested by the sender.” Read on its own, that sounds like 30 days is what you get. It is the maximum, not the default.
The clock that actually runs is in DMM 507.1.8.6. Mail without a specific address or instructions from the sender is held:
- “For 5 days if for delivery by rural or highway contract route carrier.”
- “For 10 days if for general delivery at an office with city carrier service. If the addressee notifies the postmaster of a delay in claiming the mail, the postmaster may hold such mail up to 30 days.”
- “For 15 days if for general delivery at an office without city carrier service.”
So the 30 days exists, and it is conditional on you calling. The manual also says the postmaster “may” hold it that long, not that they will.
The counterintuitive part: the small office holds it longer. A town too small for city letter carriers gets 15 days. The bigger office in the county seat, where you were probably planning to stop, gets 10.
Packages run on shorter clocks
If someone ships you something with Hold For Pickup, DMM 507.3.2.1 applies: “If the item has not been picked up within 5 days (3 days for Priority Mail Express), the Post Office makes a second notification attempt, and returns the item to the sender if not picked up within 15 days (5 days for Priority Mail Express).”
And DMM 507.1.5.5: “Undeliverable or unclaimed Priority Mail Express is held by the USPS for 5 calendar days before it is returned to the sender at no additional postage.”
Which is worth sitting with. Priority Mail Express is the expensive one, and it is the least patient at the counter. Paying for overnight buys you a shorter window to show up, not a longer one. If your arrival date is soft, ground service is the safer choice.
What we did not check
The Domestic Mail Manual governs USPS. We did not verify what UPS or FedEx do with an address they cannot deliver to, so do not carry these numbers over to them.
The call that fixes all of it
You should already be calling the destination office: DMM 508.6.3 tells you to contact it before mailing, to get the authorized facility and its ZIP code. Ask two more things on the same call. Does this office have city carrier service, which tells you whether your clock is 10 days or 15. And can you note that the addressee is traveling and may be delayed, which is the notification 507.1.8.6 asks for.
Then plan the pickup like a fuel stop, with a real date on it. Our earlier piece on the General Delivery rules themselves covers who is eligible, why it works at only one facility, and when a postmaster can refuse you. The RV living logistics guide covers the rest of the on-the-road paperwork chain.