How long does it take for iPhone 5c's battery to decrease by 1%?

I got a brand new iPhone 5c today and after restoring my backup from a previous iPhone which I decided to give away because the battery kept decreasing every 2-3 minutes, the battery still acts the same way on the new iPhone. I then decided to restored it as new and the battery now decreased every 4-5 minutes when I surf over Wi-Fi and I'm not really sure if it's normal because supposedly you can get around 8-9 hours of usage surfing over wi-fi but on my case my phone would probably run out of battery after 5-6 hours of usage?

"Wow! This Question is great, I also waiting for best answer"