How long can a car stay in garage if temps drop below freezing

Cuda416 said
Having grown up in MN, I'll say you're good to go. I parked outside with 20 or more below regularly.

You saying all you have is straight water?

yes, straight water.
The bay is attached to my showroom( car lot) it shares a wall, and its 68 degrees in here. Open a door off the showroom directly into the bay.