Yeah I've overrun that a few times coming down a 10% grade near where I work. (2013 Gen 1).
I didn't actually time it, but it seems to "reset" after about 15-20 seconds of "cool down" time.
Yeah I've overrun that a few times coming down a 10% grade near where I work. (2013 Gen 1).60kW for 10 seconds was also the max on a Gen 1 Volt, which is a 3.75C rate when paired with the initial model year's 16kWh battery.