Mine gives me a days usage with some change left in the battery.
I don't really keep an eye on screen on time.
When I created a screenshot a,while ago this,was my usage with 50% battery left.
My phone is powered up at 5am and turned off at 9pm and charged back up overnight.
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.