I find that it really comes in waves. Sometimes I will be doing nothing, and then at other times I'll be staying up until 1 finishing everything. Right now, I'm heading into a fairly busy week. I have to get the ball rolling on my Historical Investigation and on my Research Commission for Theatre, and then this friday I have an exam lab for physics and a World Lit Paper 1 rough draft due. Right now I'm not doing much, but I know I'll be staying up late on Wednesday and Thursday night.
I don't find so much that I'm a procrastinator, but more that the pressure helps me write better. I just can't start right now... I don't know why.
I'd say I have about an hour of homework at the bottom of the wave, 3 hours in the middle, and 6 hours when I'm at the top of the wave.