It'll turn off by itself after a while, so you can just leave it.
It turns off automatically in a few minutes, so you don't have to worry about it.
ーIt'll turn off by itself after a while, so you can just leave it.
「勝手に消えるから放っておいていいよ。」
turn off by itself で「勝手に消える」
leave で「置いておく」
ーIt turns off automatically in a few minutes, so you don't have to worry about it.
「数分したら自動で消えるから、心配しなくていいよ。」
turn off automatically「自動で消える」を使っても言えます。
ご参考まで!