Mine couldn’t scan my whole house in one charge either, but that’s not a problem. For me at least the vacuum got down to 7%-8% battery left and went back to its base and charged. When it charged back up to 60% it automatically took off again to where it left off and finished the original scan.
But don’t even touch it when it’s charging, my first try at getting the map was messed up when I decided to empty the dirt bin while it was charging. I accidentally disconnected it from the charger (which it’s just sitting up against) and that was enough to confuse the software and cancel the original scan. Second time through I completely left it alone and it finished like it should have. Live and learn. Sure, I agree it shouldn’t have issues like that, but they are working on it and the bugs will get worked out.
If your map is missing parts of your floorplan then you may need to delete the map and let it scan again. At least for now until they get us the ability to update the existing map which is on our request list. Lol.