I have a S7 Edge, I got 1D and 14 hours of useage.
The first day of the phone I used it with normal useage, going through the web, facebook, kik messenger, music and probably an hour of DS emulation and playing a few little games for a few minutes. The next day I used it lightly just used it for music, kik messenger and web browsing, the last few hours I didn't touch it. So we'll knock off 4 hours of me not touching it to see how far it would go. By the end of the night it was at 7% and finally decided to throw it charger. It could of made it through the night and last 48 hours.
My question is why does it say just display? Did you just leave the display on surely if you were using apps, for the 8 hours it would show them higher up on the counter for instance using android central and chrome all day. But hey I could be wrong.