If you need to visit a European country for 6-7 months but not continuously
I have read that you can visit most European countries without a visa for 3 months. Is that 3 months out of a calendar year or just three months without leaving the the European country for a period of time. If so, what is that period of time? So can we spend 2.5 months in Germany and then go back to the US for 1-2 weeks and then have another 2-3 months in Germany?
On a similar scneario if country A & B both have the 3 month rule for not requiring a Visa, as an example if you can spend 3 months in country A and then 3 months in country B?