7 am to 7 pm and everything returns to normal? The stay at home and hunker down and wait it out. I’d likely get together with at least one good friend on my floor, but hopefully the whole floor. Not as many points of entry to defend.
I’d choose a friend’s house if any had a more robust structure. That said, like mentioned above, if you demonstrate that you’re ready and willing to defend property, I’d expect potential aggressors to move on. But what if you encounter a larger mob that is intent on razing everything? I’d want a building with concrete or masonry walls.
The boat idea is interesting. I’d want it to be decently fast to avoid some other boats and maybe range to go far out to sea and stay away for the 12 hours.