Sorry for late reply

For about 4 hours i beleive. Though it used to be longer as i have had it for over a year and the battery not like it used to be.

Kde is the default desktop eviornment.

It helps that its a non systemd init system so it doesnt pull as much resources on the backend since systemwide is controlled via scripts.

If i were to run a lighter one such as xfce, qtile or dwm it would run longer(varies on configuration though)