Source: I was the chief hardware engineer for this device. Anjan can comment further to see if the team these days has any further optimizations in store, but

Source: I was the chief hardware engineer for this device. Anjan can comment further to see if the team these days has any further optimizations in store, but with my personal Daylight tablet anecdotally, these days I am charging it every other week, and using it for 1-2 hours a day to browse the web and read PDFs. I usually have a low backlight setting on it.