It doesn't say specifically, but I think these lasted more than a day, assuming you'll accept random predator species as a sufficient proof-of-concept substitute for mice which have to do many similar things but smaller:

https://www.televisual.com/news/behind-the-scenes-spy-in-the....

Those robots aren't acquiring their own food, and they're not edible by the creatures that surround them. They're playing on easy mode.

Still passes the "a machine that would survive a single day" test, and given machines run off electricity and we have PV already food isn't a big deal here.