We adopted our first Grey in the middle of February, and I think after a month she was doing really good and knew our schedule very well. In fact there were a couple days before this all started where I had to work an hour late and about the time I normally would be home our home camera alerted to movement/noise and I tuned in to see her standing by the door whining, but overall she was good. Any time I tuned into the camera otherwise she was asleep in "her" chair and would just get up a few times a day to stretch and re-adjust.
Now she will have had at a minimum 2.5 weeks of someone home with her, I have a feeling its going to be like starting over again where we were last month. She and I have had a lot of bonding time though, so some small good came of it.