At what age did you let your Cavalier have free run of the house, both when you are home and not at home?

At 7 months Coco gets about half of the house when we are home (we put a gate at the stairs), but I am still not 100% sure if she is ready to have free run of the entire house.

I leave her unsupervised at home for no more than 20 minutes, like if I am taking a shower and so far she has been good for this!

When we leave her alone longer than 20 minutes she still goes in her pen.

Just curious how old your doggies were when they got the house to themselves!