Craig, Andrew, you are not even near a win (this is a comp, I'm sure).
I use normaly about 10-15 hours a day cubing!!
My longest streak is some 36-40 hours: on the way to Helsinki open last year, all night (me and Mikael Öhman), only stoped to get of the boat and to the competition, cubing all day at competiton, only stopped to get back to the boat to Stockholm again and then cubed all night on the way home. (I think Mikael practice even more than I do, honestly =)
Ok, most time my cubing is looking for algs and learning new methods I create so it's not really practising, rather developing.