I have robot vac but I have like an acre. How much can those robo mowers do?
I got the Luba II Mini. I have ~7500 sq ft of lawn. The mini is barely adequate. I really like it, but wish I had paid the extra and went with the Luba II.
It does it, but takes a couple of charges. It finds it's way back to the charge on it's own and then continues where it left off. In the front I have to go out every so often to check on things just to dissuade any kids from wanting to come play with it. But mostly I just let it go and track it on the phone. It has very accurate tracking of it's exact position and I can even tie into the FPV camera on top and watch it mow real time. lol. I can also watch it externally from my house security cams.
In the back with the fence close I just let it go. It's locked in. It can take until midnight I don't care. It will go back the the charger and lug itself in when it's done. It is almost completely silent.
It's definitely not for hogging down field brush. I did a torture test on it the first cut. He was cutting maybe 1" off and that was a struggle on thick Bermuda and the cut wasn't that clean.
Now that it has be cut to height, heck I can run it every 3rd day if I want as long as it is the one out there sweating. So now I'm trimming off 1/2 to 1/4 in at a time and it's starting to look like a pool table top.

Every week or some I'll make a single pass on the perimeter with the gas mower and a quick run with a string trimmer. Other than that I leave it to "Gump" my robot gardener.

It comes with a charging base and they say it is perfectly fine to leave out in the weather. It was designed for that. I got the optional shade cover for it though and I like it. It kind of hides it more too.
So other than wishing I had gotten the next size bigger I couldn't be happier.