I thought I read you should clean the mirrors every 8 hours of use which I assume is actual laser use. In the settings section does machine hours mean the time the actual laser has been on or just when the machine is on? Is the standby hours time plugged in and not in use or turned on?  I've had the p2s for about 2 weeks now and the machine use is already 4 hours. I keep it unplugged when not using it. 4 hours of laser use seems high to me for how much I actually used it.