Strange concept I know but several years ago I actually contacted twin disc regarding a gearbox used on a cat build I was involved in.
The consensus was that it could happily be run in neutral for several hours at a time, water lubrication to the shaft bearings could be an issue but slots in the bearings should allow enough water inflow.
If really worried about it a small 12v pump would take care of it.
I guess what I am saying is you could always give someone a call.
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