There’s no analogue signal through the mains. The sockets are only going to be subjected to AC mains whether music is playing or not and the current drawn hardly varies either between a power amp being on and actually driving speakers with a signal. As long as things are plugged in and powered on current will be drawn over conductors.
So, if you leave the system powered on for 10 days the time will fly by. If not, it will feel like a slog that takes weeks/months.
I have only just discovered that the less exciting sound is very likely to have been by a transit bolt left in the 552 upon installation. (My brother in law can’t follow simple instructions)