The time it takes for water damage to become visibly apparent on a ceiling depends entirely on the flow rate of the leak. A major pipe burst or severe roof leak will saturate drywall and show visible staining, bubbling paint, or sagging within minutes to a few hours. In contrast, a very slow, intermittent pinhole leak may take several days or weeks of steady moisture accumulation before yellow-brown rings, damp spots, or mildew start showing on the ceiling surface. Verification: Inspect attic spaces and upper-floor plumbing regularly to catch slow leaks before surface stains appear.
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