You can stay in the Netherlands for a maximum of 90 days within a 180-day period on a tourist visa. This rule applies to the entire Schengen Area, not just the Netherlands. The 180-day period is counted backward from each day of your stay. This means you cannot stay for more than 90 total days in any 180-day time frame. If you overstay your visa, you may face fines, travel bans, or problems with future visa applications.