How much video can an iPhone 5s hold?

I have a 32 GB iPhone 5s and I was wondering how much video it can hold, if everything else that can be deleted has been deleted?
Also, how long can a fully charged iPhone last if all it's doing is recording video?

http://www.mactrast.com/2012/09/which-iphone-5-capacity-should-you-choose/

This link says 1 hour of video can use up to 10 to 11 Gb or storage.

Can't help on the battery life question.