I meant to post this at lunch, and pair it with a "the fastest way to get the right answer is to post a wrong one" joke, but since I missed that opportunity I'll just say the thing I was going to say:
This was almost certainly designed with intent to run 24/7. Network and conversion appliances like this tend to be. (Though in the '80s and '90s those individual power control centers were more common, so, like, take that for what you will.)
The problem is that it was designed in the '80s or '90s to run 24/7 for probably a service life of optimistically five to seven years.
I still think it'll be fine, but it can't hurt to give it a good once-over. Check the caps in the unit and the power supply and make sure the power supply is putting out the right voltage. If it's not, see if you can replace it with one that is, just to be on the safe side.
Re a laser printer specifically: would it not be less wear to let it idle on its own? Does it have a periodic warm-up that puts undue stress compared to if you let it cycle on its own? (Or: what wattage does a 4/600 or similar pull when idling? I would think that'd be a better reason to switch it than anything else, especially if you're printing less than, say, 1x/week. It's an HP laserjet under the hood, it'll probably outlive you if you maintain it reasonably well, and this was one that does match another laserjet model (unlike the LWS360) so there is a pool of spares.)
