Maximum estimated battery usage

[Solangeburgas]

I have this S7 edge as my second phone, so for me battery stands 3-4 days in stand by easy.
When i charge phone estimated battery usage is showed, based on average consumption of the last 7 days.
Last 2 battery charging cycle was made on 4 days of stand by, meaning aprox 100 hrs.
But estimated usage is still 50hrs. Does anybody see an estimated usage more than 50 hrs ?
I saw this estimated time way below 50 when i was playing and make various settings and installing/dezinstalling apps. But never more than 50.

 

[Solangeburgas]

My wonder is Samsung math. Dont know if Samsung or Android, this my first Android phone, but sure the math is different than mine
So, when i fully charge phone he has an estimate of 50HRS - based on medium consumption of the last 7 day. But after 2d and 15 hrs of stand by and some usage phone drops just 24% and estimated remaining time drops from 50 hrs to 38 hrs. So he manage 2 d and 15 hrs with only 24% and he thinks rest of 76% will last just 38 hrs
So , I have a real consumption in stand by of 0.38% / hour. AOD off and WIFI only when charging. Location on, mail fetch every hour, weather widget reload every hour, display at max without auto checked... so not very economic.
I know, this is based on medium consumption of the last 7 days. But in the last weeks (2-3) one battery cycle last for me at least 4-5 days.
Sure, when this cycle of battery will be done at rechearge phone will declare proud : battery will last for 50 hrs. X files indeed
I think is a problem with battery management, by the way exactly the same problem on iPhone. I wonder if this part of soft is the same for both operating systems. Probably made by a third part for both IOS and Android.