Schengen 90/180 Rule
For many non-EU travelers on a short stay, the general Schengen limit is 90 days in any rolling 180-day period. It limits time in the area and does not itself authorize paid work.
In practice
When routing through Schengen countries, count days across the area using the official calculator and check which rules apply to each traveler’s status. Residence permits and long-stay visas can be treated differently. Confirm performance and work authorization separately before committing dates.