U.S. citizens with valid passports traveling for tourism or business can enter France without a visa for a period of 90 days within each six-month period. For French visa information please see the French Embassy's website .
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This regulation is strictly enforced in Italy. U.S. citizens may enter Italy for up to 90 days for tourist or business purposes without a visa. All non-residents are required to complete a declaration of presence (dichiarazione di presenza).
There is no set period you must remain outside the USA before returning but: When traveling to the U.S. with the approved ESTA, you may only stay for up to 90 days at a time - and there should be a reasonable amount of time between visits so that the CBP Officer does not think you are trying to live here.