To piggy-back off of
@DopeyBadger here just a bit ... I've done one weekend of races undertrained (all three at Tinker Bell Weekend), and it was what started the ball rolling towards my injuries over the summer and through
Disneyland Half.
While, yes, the key to marathon training singularly is the long run on the weekends, the key to Dopey is the build up of weekly mileage and back-to-backs. Try to focus on that, if you can. Even if it's just two miles EVERY day and a long run on the weekend, you're still in great shape for Dopey rather than the sporadic runs and crazy-fast buildup of mileage. Even 30-45 minutes of serious running every day, combined with a long run on the weekend and a complete rest day will be more beneficial to you.
For example, today I ran for an hour (just about 6 miles) and then I rode my bike for two hours (almost 24 miles). The two combined equal aerobic output greater than the time it takes me to run a half marathon. Sure, I didn't run 13 miles, but with the cycling I actually worked harder than I would normally running (based on my HR). It will make my runs the rest of this step-back week faster, and actually easier.
I know as a college student that your schedule is busy, but if you have to take 30-45 away from things like being here on the DIS to get in a short maintenance run, you'll be much better for it in the long run. Or, if it's not 30-45 minutes of running then go for 30-45 (or even 60 minutes, if you can) of some other form of high-impact aerobic activity to maintain the level of aerobic fitness you'll need to complete Dopey. Upright/recumbent stationary bike at the gym does just as well - or an elliptical or summit climber - and you can do whatever reading you need to do for class while you're doing it.
Have you experimented with fueling or anything like that yet? The Marathon this year was humid and HOT - likely very different from any situation you've ever been in training in Wisconsin. If you haven't yet, I'll send you some things to just try on a daily basis and see how your GI reacts. You WILL need to fuel and hydrate outside what is offered on the course, especially if you are planning on park touring without an immediate recovery period after you finish the Marathon.
That's a great sentiment - but did he do a marathon on the fourth day after a 5K, a 10K, a half marathon and full days in the parks? Even a rubber band only has so much stretch in it ...