I wish I got that kind of time on my s6 edge. Mine does not even come close to my last two phones, the 6 plus and the Note 4. I rarely get over 3 hours of screen on time with a single charge. Often it is less than 2 hours and 45 minutes.
This is what scares me about getting S6..great CPU ...great Camera I could make great use of...good Speaker..
BUT - this would be a problem for me as a heavy user.
I get about 3.5- 4.5 hours SOT on my Alpha- but pop in a spare Battery.
Hoping Samsung has a S6 Pro or a variation of S6 Active with No Hardware buttons no oversized Armor...
Just a thicker S6 with a big Battery- and they may have to call it Note 5 Compact to avoid angering the S6 users....lol.
And it will have to be expensive ..a Marketing Tier that avoids conflict with S6-
Note Compact with 5.0 or 5.1" screen....or Note Pro..just a Note Type ( no stylus) or an S6 Pro with big battery (with a different name).
OR a nice graphite/ plastic/ or metal backplate for replaceable Battery like Alpha has......Productivity Devices don't need pretty backs.
Also as an Active Person- I was afraid of carrying a medium or larger Phone (5.0" or even smaller like Z3 Compact) because of " Pocket Flex" screen breaking from bending in front pocket.
The Metal Phones like Alpha /S6 are more Rigid, Durable less breakable and require smaller Cases- great!
I don't care about the back very much ESPECIALLY if I can carry a spare Battery.