Posted: Wed May 17, 2023 9:51pm
Simply put, once you have done 90 days in the Schengen, you must leave the Schengen for an equivalent period.
There’s a lot of advice about how to count back, but it can be confusing. The safest method is to use or download one of the various Schengen calculators. You put arrival and departure dates in and it will tell you how much you’ve used and how much you have left. Particularly useful if you’ve returned to UK and want to know when you can return.
Whilst it hasn’t been raised, it still bears saying that on a UK passport, there is *NO* long stay tourist visa available. As a tourist, 90 days is your limit.