I think you should really concentrate on training your tolerance to alcohol.
You use one word in there very well - "drastically". Your issue is that unless you ran a marathon a couple of months ago, which from your post I assume you didn't, you simply aren't trained to run a marathon. If 4-6 mile runs are what you're about at the moment you aren't really trained aerobically to run a Half-Marathon, though you are capable of completing one.
If it's your first marathon, you should expect to be out on training runs lasting about 4 hours, looking at your HM time. These should cover around 20 miles, and you should do a few of them, say five, separated by about a week for recovery, or maybe two weeks with slightly shorter long runs in between. Add to that a couple of weeks taper and you're looking at a minimum of two months, with you being up to 20 miles today. Drastically is definitely the word for the increase required. BUT, if you even attempt to get up to those levels now you will fatigue and very probably injure yourself.
A rule of thumb is to increase your training miles by 10% per week. As you can see, from where you are now, even from a 10 mile run, this won't give you safe time to build up to anywhere near what you need to know you will complete the marathon.
So, there is a dependence upon your general level of fitness and strength, and maybe you can consider just trotting/walking round on the day to complete the distance without any goal in mind except reaching the finish. I wouldn't do this personally, but if you have to do something (and you don't have years of alternative training - cycling, rowing, something - to back up your running) then I'd do this rather than push myself to become properly fit for the distance. The latter will lead to injury and no marathon.
God! Doom sayer!
cassie, ignore ratzer, what he's saying is correct if you want to be optimally trained, but if you want to "get around" it's perfectly possible from where you are now. Have a look a Hal Higdon, whether you follow his plans or not doesn't matter but take a look at the long runs he gives for a novice over the time you have left. I did my first marathon using a hal Higdon schedule. From an aerobic base of 2 months followed by 4 months of nothing then following his plan for 4 months to the letter I did my first marathon, ran the whole way, in 4:17 which I was chuffed with. So with your base, go for it!
Yeah, I did lay it on a bit didn't I? But Nov' 2013 isn't that far away!
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