I have set two iPhone 14 Pro Max's restored from the same back-up. One has AOD on the other one off. They've been sitting at my desk, I'm checking them every hour since 5. 3 hours later they are all still at 100%. Let's see what it will say in the morning.

4 hours later AOD is at 99% the rest is still at 100% By the way I deliberately placed AOD right under the light to keep it on at max AOD brightness. At this point I feel like I can say it drains ~1% battery max in 4 hours.