Frankfurt
The answer to that question is Frankfurt.
A frankfurter sausage ! with the right mustard. (Frankfurt, Germany)
Frankfurt
three days
About five to seven days.
exactly one week
The best known is Frankfurt am Main. There's also Frankfurt an der Oder. Smaller towns include Freudenstadt (in the Black Forest). If you want a complete list consult the Buch der Postleitzahlen.
Some cities with the letter "F" in them include: Frankfurt, Germany; Florence, Italy; Fortaleza, Brazil; Frankfurt, Kentucky, USA; Freiburg, Germany.
About 4-7 days by airmail.
Allow 3 to 5 business days.
First Class Mail is delivered in three to five days.