About a month? Enough time so that if it were harmful, damage would've been evident. But it worked right up when I replaced my accumulators and refilled the system. It is after all just an impeller, with the other side lubed with tranny fluid.

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project