By the time my other 3 bullies were about a year old, I was able to leave them out with the run of the house. I also had two other dogs (boxers) at the same time as each of those bullies, so they had company and the boxers didn't run around tearing stuff up. Maybe the boxers were good examples! But basically my other bullies slept most of the time when I was gone (as far as I know), and I was working then.
Winnie is 9 months now, so I'll probably try her when she's a year old. I think she'll probably be fine by then (I hope!).