An achievement stamp given to you for sending a letter that'll take a long time to deliver! It should serve as an acknowledgement of those super long distance friendships we make on this app!

"A Letter On a Long Journey!" - Send a letter that takes 30+ hours to deliver.

Stamp description: A letter folded into a paper airplane. The background should be separated into 3 or 4 distinct locations to symbolize the different areas of the world the letter is flying through to arrive to its recipient.

I also thought of an alternate version of this stamp:

"A NOT so Long Journey..." - Send a letter that takes less than 10 hours to deliver.

Stamp description: 2 people exchanging letters in person to symbolize the comparatively shorter distance the letter has to travel.