The delivery time depends on the service contracted. It is the distance that the mail or parcel must travel to arrive at its destination, and some external factors. The Chunghwa Post delivery will arrive at its destination the next business day in Taiwan's national territory. The international post order will last a bit more depending on the distance of the country to arrive. For mails and parcels sent to any country in Asia it can last for at least 10 days; however, you can always pay the express service for a shorter time. For other continents, it can take 2 weeks for Europe and Africa and almost 3 weeks to arrive in America.
The wonderful thing is that you count on the Chunghwa Post tracking service to know how much time it will take to arrive at your country and when it will be available for you to take it from your local post office.