I don't want to say it's bad. But it's also... not good. For me, the S6 edge+ can barely, and I mean barely, eek through a day of away-from-home usage. And sometimes it can't even manage that, and sometimes it can't even manage it when I'm using the power saving mode.
Most of the drain is hard to manage, too, because it seems to occur when the phone is idle. There is no unusual process activity in battery stats, and even with VoLTE disabled, the battery life is still plainly subpar.
Three hours of screen-on time was doable if I actively worked to burn through the battery by mid to late afternoon and then charge back up, but even on days where I wasn't even using the phone for more than an hour or so, it would still end the night at under 50%, most of that just being idle seepage.
The Note 5, I have to assume, is similar - I simply haven't used it as my true daily device, but the internals, including the battery, are the same, and there's no reason to think it would use any more or less power to significantly change the experience.