What is USPS International/Global Delivery Time

What is the expected shipping time or expected arrival time for USPS mail to international destination?

USPS Delivery Options	Expected Arrival Time
Global Express Guaranteed® (GXG) Reliable, date-certain shipping to over 190 countries.	1 to 3 business days
Express Mail International® (EMI) Reliable, expedited service to over 190 countries. Now available with day-certain delivery to select destinations.	3 to 5 business days
Priority Mail® International ( PMI ) Reliable, priority handling to over 190 countries worldwide.	6 to 10 business days
First-Class Mail® International An economical way to send items 4 pounds and under to over 190 countries worlwide.	Varies by destination country
Airmail M-Bags An economical way to send printed material in quantities to one address.	Varies by destination country

The above expected arrival time is only estimate, not exact due to some unforeseen circumstances such as flight delay, customs inspection, transport delay, etc.
For more information about this USPS service you can check it on USPS - Send International Packages