In a heated garage I would not be to concerned but I would run it in fresh water for a while until well warm, (to rinse out salt) then run a anti-freeze mix just to protect it. Change the oil/filters, at 20 hours you don't need to do the water pump impeller, but I would spray a light coating protective oil on the block just to keep it looking like new and inhibit any rust. Again, at 20 hours it is a new motor. Nothing wrong with some fuel stabilizer while it is being rinsed either.
Heated garage...nice!
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