Schengen rule is a bit confusing. After my parent spent 89 days in Spain (March 3rd - May30th) are they allowed re-entry to Spain 90 days from the day they arrived in Spain or 90 days from the day they departed Spain? Also how many hours upon arrival must they be in Spain for it to count as the first day? They are flying in from England and arrive early afternoon. They need to be out of the USA for 183 days in order to qualify for a tax break.
Losing my mind,
Thanks for your help.