Are you guys for real? This is ridiculous! I've been on the old Nexus 5 for ages. I think, if we aren't going to get Android 7, then maybe it will be time for me to switch to one of the fringe mobile operating systems.
I get about 20 - 40 hours between charges, depending on whether or not I need to use Google Maps that day, and I often stay in airplane mode when I am working.
Airplane mode is cheating. My Nokia 920 lasted for a literal week during my honeymoon. It sat in the room in airplane mode and zero usage other than an alarm clock and a few dozen pictures. No one cares how long a smartphone lasts when you're not doing smartphone things with it.