Question about iphone 5 battery life

I have a galaxy s2 and i might upgrade to the iphone 5. I use my phone for a couple of things:

1.Web browsing

2.Music

I literally do this non stop until the battery goes dry. I get a average of 3 hrs and 23 minutes of screen time on my gs2. How long will the iphone 5 last when web browsing/music.