You are right on the money, Little John. In addition to having to get the engine hot enough to boil off any condensation, it has to be there long enough to evaporate the water completely. This is difficult to achieve sitting still in a closed garage. I personally never start them in storage, unless I am going to ride them. In very long term storage, I will turn the engines over by hand once in a while, to prevent seizing and to coat the gears and such with a fresh coating of oil.
The oil temperature is usually hotter than the water temperature on an engine, but keep in mind that we were just told in another post that the fifth bar on the water temp gauge doesn't come on until the water is 212 degrees. Just at the boiling point. Assuming the oil is a little hotter, it would take several minutes running at a level of at least three or four bars to evaporate the water. Hard to achieve in a cold garage in the winter. My preference, keep the batteries charged, and either ride them periodically, or completely mothball them and let them sit quietly. These methods have not failed me for dozens of motorcycles and cars, and many decades of collecting them.
-Scotty