Battery Reconditioning

I wanna buy it. It’s the 300 dollar one. But how long is the battery life if you’re just listening to music or surfing the web? I won’t play very many games on it, I know that takes up a lot of battery.

it says "36 hrs music playback" "9 hrs wifi"
I can usually go an entire day using it (music, apps, games, internet) then just charge it at night