A normal residential toilet tank should take between 45 seconds to 60 seconds to refill completely following a flush cycle. If your tank takes several minutes to fill up, it typically indicates a restricted water supply valve, a clogged fill valve filter cap, or low home water pressure. Conversely, if it never stops filling, the flapper or fill valve is leaking. Verification: Use a stopwatch during a refill cycle to confirm the tank reaches its proper water level within one minute.
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