Basically, as above, at any time you will always have less than 90 days available to you until/unless you've spent all of the last 180 days outside the Schengen Zone.
If you do a Google search, you'll find a number of "Schengen calculators" into which you can enter your past and future planned dates in the Schengen zone, and it will validate them (or not ;-) ).
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