i kind of agree, but only to a certain extend. those pauses during screen on times are counteracted by standby drain, when the screen is off. u dont have those during pcmark runs, so all of the available battery capacity can be used for SOT. in regular usage u also have a bit of energy going into screen off times though.The PC Mark SOT is calculated for 95% of battery usage, not 100%, so a 16 hours SOT translates into 16 hours and 50 minutes for 100% battery.
Even with this adjustment, I have a feeling that these PC Mark SOT figures tend to be smaller than what you would get in real world.
PC Mark tries to emulate normal usage with many tasks, but looking at its screens while its running, I get the impression that it is somewhat accelerated.
When a real person is performing the same tasks, he/she will always be at a slower pace. Sometimes taking a look around, or talking to someone with the screen on waiting, or giving small pauses for many other reasons. The battery has a lot of "rest moments" and drain will be smaller during these moments. PC Mark imposes a higher pace with no "rest moments".
So a real person usage will most certainly translate into a higher SOT than the PC Mark benchmark, even after adjusting the SOT to 100% battery.
however, since u have the same conditions for all roms the results are still comparable and give a nice overview on what one could potentially expect
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