Hi Wendell! Would that be by snail mail or courier?
If snail mail... the regular postal service in Panama is pretty bad, and letters can take several weeks to arrive. Also, they only deliver to P.O. boxes ("apartado postal"). In my experience, mail sent to regular addresses simply disappears.
Courier services like UPS or Fedex take 2 to 3 days, but the cost is ridiculously high.
To receive regular snail mail from the US, I have an account with Mail Boxes Etc. (you can receive correspondence and larger packages with them), they have an address in Miami and my mail is sent there. It then takes less than a week to arrive in Panama and costs a few bucks.
There was an earlier discussion going on about mail services in Panama, with more details, it is here:
http://www.panamaforum.com/living-pa...-ups-fedx.html
Hope this helps!