A properly functioning toilet should take between 45 seconds to 60 seconds to completely refill the tank and shut off automatically after a flush cycle. If the fill valve continues running past one minute, or if it hums indefinitely without stopping, the fill valve float is stuck, misadjusted, or clogged with mineral sediment. Verification: Time the refill cycle with a stopwatch from the moment the flapper drops until the fill valve shuts off completely.
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