About the only time I get any silence and can 'almost' guarantee, some privacy, is on the toilet. Even then, DS will call for me, AW will decide that the question she has is urgent, or the dog is whining right outside - because a closed door is just not FAIR to a 100# wussy ball of fur!
I can get silence while driving to/from work, but then it's rush hour and there isn't much 'peace and calm' that can be had