altri siti dicono le stesse date più o meno ma...
uno di questi aggiunge:
There is no time guarantee for Letter Post and packages are not trackable. The US Postal Service indicates that packages sent via Letter Post generally reach their destination country in 4-7 business days. This does not mean that your package will be delivered to you in 4-7 business days. When a package reaches the destination country, the destination country's customs office takes possession of the package and the amount of time each package remains in customs depends solely on the customs department. Once the package clears customs, delivery times are dependent on the destination country's postal service. HPDI has no control over worldwide customs departments or postal services. 1-3 week deliveries are typical.
direi che è chiarissimo. ci mette 4-7 giorni per arrivare in Italia, da qui sono fatti delle poste e quindi i ritardi (secondo questo sito) sono attribuibili alle poste italiane.
in genere -aggiunge- dovrebbe metterci 1-3 settimane.