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The screenwriting convention is one minute of screen time per correctly formatted page, so a 95 page script runs about 95 minutes, or 104.5 with a 10% allowance for action sequences that take longer to shoot than to read. A standard 90 minute feature therefore lands near 90 pages, which is why page count is the industry's proxy for runtime.
Runtime
minutes = pages x minutes per page
With action allowance
total = base x (1 + allowance)
Approximately, for correctly formatted Courier 12 point screenplays. Dialogue-heavy pages run faster and action-heavy ones slower.
Because a single line like 'the chase continues' can describe two minutes of screen time, so the page count understates the runtime.