My daughter wants to volunteer in Italy and Spain for her Gap Year
I know that there is a 90 day maximum stay in Schengen countries for a 6 month period. Does this mean a total of 90 days for ALL countries or EACH country. She wants to do 90 days in Spain, 90 days in Italy, and then 90 days back in Spain. Is this possible or she would have to return to the US for 90 days before returning to any Schengen country?