I think at this point I have it basically down -- I recited it a couple times while walking with only brief stumbles. It's somewhere between 7-10 minutes long, depending on how much I pause. I've figured out why slam poets tend to do that weird sing-songy thing -- it gives you more time to think. :-)
Now shower, dress, and try actually rehearsing it as a performance, with, y'know, emphases and gestures and stuff.