A standard residential sump pump can run continuously for several hours during an intense, heavy rainstorm, provided it is properly sized for your basin and water is discharging freely. However, if a pump runs uninterrupted for 12 to 24 hours or longer without stopping—typically caused by a stuck float switch or an overwhelmed basin—the motor will rapidly overheat, degrade internal windings, and suffer permanent thermal burnout. Verification: Check that water is actively evacuating through the discharge pipe and ensure the pump turns off once the pit empties.
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