How long it takes?
Well your range was 60-bit wide so something like 2 seconds from boot to finish. Around 5 MB of RAM usage.
What was the point of this exercise?
327EF00CB359064B is private key for 19KbdoUvvD3CdTy78VNaLEjhzQfn55P89B
not 18bHfcm8kGoAhBaQXzzVcG5534mdpWK981