Standard (first class) mailing is 1 calendar week in the US; 2 weeks to Canada; and 3 weeks or more to all other countries. Please note that standard mailing does not have tracking.
Mailing can also be delayed a day or two due to weather, USPS reliability issues, or due to seasonality (e.g. Christmas). If it's been at least four business days past the above guidelines for your destination, please contact support.