Depends on the distance but this service is listed as 2-9 days on USPS's site. The service is slower than Priority Mail and First Class, for perspective.
If you're using electronic postage from a service like Endicia and their Dazzle software, you'd have access to Parcel Select which is Parcel Post but a bit cheaper, same delivery time and includes delivery confirmation.
The related links explains expected delivery days for each USPS service level:
Parcel Post via USPS: about 4 -10 business days
post office
The amount of time it will take for a Parcel Post shipment to get to Anchorage Alaska via the USPS will depend on where it is sent from. Parcel Post is now called Standard Post and it takes 2 to 8 days for delivery.
The price of intercontinental parcel post delivered by USPS å£79.95. This is the flat rate boxes service, so the price will be different if it exceeds the 20lb weight limit.
It can take up to a week. It really depends where you at.
How long does parcel post take to get to Nigeria from UK
I would say from 5-10 days even longer during holiday/back to school season.
USPS Parcel post typically takes 2 to 9 days for delivery depending on the orgin to the destination.
First class means it arrives faster.
Mail there is somewhat inconsistent. I have sent things parcel post with the greatest consistency, and sent things Priority that took a lot longer.
UPS and USPS will pick the parcel up at your home. You will, however, need proper postage. This can be obtained at your local post office.
As long as USPS wants. They quote 5-9 days but can take as long as 14 days, and there is no delivery time frame guaranty.