If, for any reason, you overstay, you might have to bear consequences such as –
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Being fined
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Future Schengen visa applications to be reviewed further than the usual scrutiny and might be refused altogether
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Processing time for future visa applications to be extended, from anything between 30 to 60 days
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You also stand the risk of being banned from entering the Schengen Area for 2 to 5 years.
Although no general policy on overstaying penalties exists for all the Schengen member states, each country imposes various types of penalties.
Therefore, the implications of staying too long in the Schengen territory, whether your visa or the 90 days allowed for citizens of the countries protected by the visa waiver scheme, depend a lot on the number of days you have overstayed too long and the country you have overstayed in.