Mine is plugged in 24×7 in my office/alternate media room, prominently displayed. I had the same idea to add an RTC after losing the time during power on/off. Some folks (my daughters) say it is too bright, so I turn it off when they are in my office for an extended period. I haven’t explored the menu options enough, evidently, as I didn’t know I could lower the brightness.
Great to learn learn it has an RTC already. I’m not really worried about power draw, it’s more the ability to keep the time between power outages, toggles, etc. Would also love to auto dim at night, which sounds like an easy software mod I’ll explore.
I’m getting ready to move from “stare at its awesomeness” to “hack at it” mode, so I’ll pull the board and look at the RTC chip and pins.