It depends on the model. For my XPS 15 with the bigger battery I can get up to 10 hours working on Python dev and checking out docs. But only when disabling the discrete Nvidia card, which is relatively straightforward[0] to do after having suffered setting up bumblebee.
Glad I'm not the only one having an awesome experience with Linux on the XPS 15 (a 9560 running Fedora in my case). Some of the stuff I've come across on the internet seems to imply that it's impossible to run Linux on this thing and I've had no issues at all!
I was just thinking about this today as I needed to conserve battery power on my xps 15 for an airplane trip. Thanks for reminding me to check out bumblebee.
0.https://github.com/khllkcm/dotfiles/blob/master/.config/scri...