A normal residential toilet tank should take between 45 seconds to 60 seconds to fill completely following a flush cycle. If your tank takes several minutes to fill up, it typically points to a partially closed water supply shutoff valve, a clogged inlet filter screen inside the fill valve, or low home water pressure. Conversely, if it never stops filling, the flapper or fill valve has an internal leak. Verification: Use a stopwatch during a refill cycle to confirm the tank reaches its proper water level within one minute.
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