As that answer suggests " the S-92's oil protection system protected the transmission .......... "
It is referring to the S-92's only Oil Protection system. A basic cooler bypass system - And yes, I would expect that to work for quite a while. Sikorski have managed to mis-market their Gear Box safety system so effectively that even pilots flying the 92 seem to be under the misapprehension that it will run dry for at least 30 mins.
At least there is an 'honesty' with the 332 that you know you are in the water if you lose Gear Box Pressure. The 225 it seems states 30 mins if the Emergency Lubrication is running, but that may be enough to get you down or to a safer place to land.
I am shocked at how quickly this Gear Box lost pressure, but I think if you accept the worst case, the cork pulled from the sump of the Gear Box, knowing there is not reserve or dry running, who would now be flying them around at 9,000 ft ?