Marathon Training

I did my longest run yet for my marathon training this evening - 14.5 miles, 7:51/mile. It was supposed to be a 15 mile run, so it's kind of sad I didn't have the motivation to run another half a mile after doing 14.5, but by that point I was more concerned with not passing out. Now thinking about doing another 11.5 miles??? Holy shit, that's going to be hard - I guess I have to count on better weather, adrenaline, and Jeremy pacing me so I don't run my customary 6:30 first mile and lose 15 secs every mile afterwards. I can tell you this, at this point, I'll just be happy if I finish it, I don't care about my time (though under 4 hours would be nice).