Within Canada:

For lettermail within Canada, using Canada Post, the average shipping time is typically around 2 to 9 business days, depending on the specific destination.

To the United States:

When sending lettermail from Canada, to the United States using Canada Post, the average shipping time is generally about 4 to 10 business days.

International:

For lettermail to overseas destinations, the average shipping time using Canada Post can vary. It may take approximately 4 to 14 business days or more, depending on the destination country, local postal services, and customs processing.

Keep in mind that these are general estimates, and actual delivery times may vary based on various factors. It's recommended to check with Canada Post for the most accurate and up-to-date information.