How much battery do you have left? That's the important question here. Remember that the 59% screen usage is only a percentage, not an absolute. Although many people take it to mean the screen is working overtime, it could also mean that the OS, phone standby, etc, are all working more efficiently, and therefore are using a lesser proportion of battery.
I find that I can get at least 5-6 hours of screen on time on one battery charge. If your battery is down to about 60-70%, you're about right.
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