A short-stay Schengen visa (Type C) allows a maximum stay of 90 days within any 180-day period across the entire Schengen Area. This limit applies collectively — time spent in other Schengen countries during the same trip counts toward the 90-day allowance, not just the days spent in Estonia. Travellers should plan their itinerary carefully to avoid overstaying, as doing so can result in entry bans and complications with future visa applications across all Schengen member states.