When someone sends you a letter, you will receive an immediate notification, followed by the appearance of a new letter in your app with its content hidden.
Similar to physical mail, the delivery time for Slowly letters can vary depending on the geographical distance between you and your pen pals. As a result, you won't be able to read the letter until it arrives at your location.
To check the remaining delivery time for your letters, you can locate them in transit on the Home screen ( ). Simply tap the inbox ( ) to view the remaining delivery time for each letter.
Once your letter has reached your location, you will receive another notification, and the new letter will be accessible on both the Home ( ) and Friends ( ) screens.