A Greece Visit Visa allows you to stay in Greece and the broader Schengen area for a maximum of 90 days within any 180-day period. This means that your total stay across all 29 Schengen member states combined must not exceed 90 days. Overstaying your visa validity is a serious violation of Schengen regulations and can result in consequences such as deportation, fines, and future visa rejections. It is essential to carefully plan your travel dates and ensure your stay falls within the permitted duration at all times.