Thanks for sharing you excellent experience on broodies!!!That should be just enough time I think. You can kind of tell their demeanor changes from "thinking about being broody" to "serious business broody" after about a week of sitting. They take shorter breaks and don't even look at you as much, lol.
I've never tried less than a week of sitting though.
All of my broody hens accept eggs and most of them accept chicks after dark placed under their wings. If you're unsure of her or feel like she won't accept them after hatch then you can wait to give them to her until lockdown and she should still treat them just like she did all the work. Lol