A standard residential sump pump can typically 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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