Ok. This project has, until now, been mostly focused on Mail Delivery Time within the US.
But now, it seems that I need to expand my research to include how hard it is to send a letter to someone in the US from outside the US.
So, if you're outside the US, please sign up for my #StickersAndStamps project
If you're outside the US, I will ask you to help me collect data on sending a letter to the US. I'll send you more info when you sign up