RunnerGirl77 says:Marked Man, we all have runs where we "tank" at the end of the distance or time. The purpose of the Long Run is to extend the distance that your body can keep moving, giving yourself a better chance of repeating this EASIER on race day.
You have a few things going for you here. MCM is still 1-1/2 months away, enough time for four more of the "longer" Long Runs to extend your distance. If you are new to running anything over 12 miles, the first time through marathon training can be an "eye opening" experience.
MCM is a late October marathon. Let's hear it for being able to run in cold or at least cool weather! My best race times at ANY distance have been run between late October and late March, and I live in the area of Buffalo, NY, home of the Lake Effect.
Lastly, you are training on hills. MCM does have a bit of an elevation change at the start, but after that, it pretty much resembles a pancake. You will be SO much stronger from your training, that this may feel like a walk in the park. I might suggest driving a bit to an area where you can run a couple Long Runs on flatter terrain, just so you have a feel for it before race day.
Don't be afraid to walk your water stops. Getting fluids into you will improve your running performance, and even with the walking, it will only amount to roughly two minutes of waterstop time during the entire race. Most water stops pass by quicker than we give them credit for.
Please post back and let us know how it goes.