Others have mentioned thinkpads and in my experience the better ones all get 8h+, just stay away from the X1 carbon (my current work machine) with hybrid nvidia graphics. Those have problems of not turning off the external GPU and sucking the battery empty, but that isn't just a Linux problem it seems from lots of forum posts.

It has been a while since I daily drove one but my old laptop used to have an nvidia hybrid setup and it was possible to get power management to work decently with it but that might have been me being lucky with the configuration. Thanks for the headsup.