Any9one ever look at the math that calculate heat transfer efficiency?

NO

Of all the variables in that calculation TIME is not one of them.

The primary variable is heat differential.

The higher the difference the better the transfer. So please stop with the time in the block/radiator wives tale.

As for thermostat temps, that is the floor, not the ceiling. Running an engine cool is not a good thing for anything other than a dedicated race car.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.