Mostly one week time. I live in Puerto Rico and have been receiving a lot of packages trough USPS.
From the US, no.
USPS Priority, flate rate box if possible!
Yes it is.
Yes!
No. When counting days for Priority Mail, USPS only includes business days.
USPS Priority Mail is when your package or letter is delivered within 48 hours. USPS will pick the package up at your house for free and you'll be given a tracking number.
It can take anywhere from a couple of days to several weeks. There are no guarantee's on priority mail during the holiday (USPS). The only guaranteed mail delivery is USPS Express Mail.
Visit usps.com to find a local post office near you. Bring the package you wish to mail and they can answer all your questions there about prices and shipping times.
Priority 1 mail through USPS.
Priority mail takes 2 - 3 days within the US.
Same state-to-state prices apply. Puerto Rico use USPS for postal service.
Mail there is somewhat inconsistent. I have sent things parcel post with the greatest consistency, and sent things Priority that took a lot longer.