I am unsure of the status of KDE offhand, I'm getting a bit north of 5 hours when on a plane and on wifi.
I would love to find some script or tool that can just grab all my logs and chart them out so people can share their results in a more reliable manner because I suck at keeping track of this kind of stuff by hand.
Flatcar linux (this is what I use for my NAS/homeserver) and CoreOS are both good.
edit: OpenSUSE has microOS: https://microos.opensuse.org/