how many recording hours can i have on the 80gb sky + box ?

Answer 1

Great answer above but have you considered upgrading the Hard Drive?

So long as you get one that can spin up to speed quick enough you can treble your capacity for the sake of a few quid and 20 minutes of your time.

I'd wait till the warranty on the box is up but then why not give it a go.

Answer 2

63 mins uses 4% so...

63/4 = 15.75 mins *100= 1575 mins which is 26 hours and fifteen mins