5-8 out of twenty typically, 13-14 out of twenty preferred if I can get away with it without the wife getting upset.
My smaller 12X12 room where the equipment is was built with insulation in the ceiling and interior walls in addition to normal exterior walls and has a solid wood door (compared to hollow normally) so that I would have a place where I can crank things essentially at leisure without disturbing others in the house, even late at light.
In my big room and in my wife's sunroom in particular, I have to be a bit more "controlled".
My smaller 12X12 room where the equipment is was built with insulation in the ceiling and interior walls in addition to normal exterior walls and has a solid wood door (compared to hollow normally) so that I would have a place where I can crank things essentially at leisure without disturbing others in the house, even late at light.
In my big room and in my wife's sunroom in particular, I have to be a bit more "controlled".