It depends on its origin and destination.
couple of weeks
15 days
postcard are still used widely. Postcards take a long time to reach.
Yes, but he will probably throw it away.
20 years
25 seconds
So far it appears that you receive postcards by opening up Mystery Gifts.
Ca. 1 week.
About 2-5 days.
3 weeks roughly
The amount of time it takes to mail a postcard from Paris to America will depend on the post offices and also the weather. In most cases, it would only take up to a week for the postcard to arrive in America.
The time it takes to send a postcard to its destination can vary depending on the distance and the postal service used. Typically, it can take anywhere from a few days to a few weeks for a postcard to reach its destination.