I started on a full charge and have been using Adobe Lightroom and I'm down to about 30% after 1:45 of use. Curious if this is considered normal? Thanks.
I've had around 4 hours out of my fully loaded 13" TB but I've also under 3.
You can't really simply say 'I've been using Lightroom' as there are so many variables. How much importing, what size files, what editing tools used, how much zooming in to 1:1 ratio, building smart previews, screen brightness etc etc. This is especially true with the 15" and it's dGPU that might kick in.
Like anything to do with the battery, unless you're comparing indentical usage patterns you'll never really know how well your battery is performing for the task at hand. My guess is, as most would.
I equate battery consumption posts to fuel economy posts when I used to use a car forum a lot. Just too many variables unless a common test is performed, so try not to worry about it and just use the machine as you need and enjoy