Powdertoy.co.uk - 28 hours a day.

Powdertoy.co.uk - 30 mins a day
9gag: 2 hours every 2-3 days
Blockland forums: 30-45 mins a day
MC forums: - news section, 1-2 mins a day; Redpower thread: 5-10 mins every 1-2 days
MS Paint Adventures: 5-10 mins a day
Bittersweet Candy Bowl: 3-6 mins every Monday, Wendnesday and Friday

Unlike you I spend most my time gaming instead of websurfing :P

Hmm...

I have no idea about times I use them, but I post in order from most used to last.

Deviantart
FB
Twitter
Powdertoy

And then my time consumer #1: drawing, like 5-10h daily.(No it's not a website, I know.)

powdertoy.co.uk - 20 minutes
gmail.com - 45 seconds
grooveshark.com and docs.google.com and equestriadaily.com simultaneously - 6 hours
facebook.com - 5 minutes
fimfiction.com - 1 hour

edit: oh hey @boxmein by the way your website needs more dragons, cowbell, explosions and ponies.
Definitely more ponies.

powdertoy.co.uk - An hour
4chan - 2-5 hours
YouTube - Most of the time
Sh*t On My Phone - ~ 12:00 AM - When I Feel Like Going To Sleep

I refresh the forums every now and again so im basically there 24/7

MMGN minecraft forums
Carbongames forums
Powdertoy forums :D
AND
im on face book for about 10 minutes ever day