Julie, 20 miles will get you to the finish. Trust your plan and enjoy the taper. For my 4th marathon, I only trained to 18 miles. It was a trail marathon and much harder than the flatness of WDW. I was fine. Just enjoy the ride...or should I say run.1. Is 20 miles really a long enough run when training for the full? My training plan has a 20 miler as the longest run. I did it yesterday and survived, but I honestly don't think I could have done 6.2 more miles. I'm very nervous that I won't be able to finish.
There are several factors that will determine this. #1 is hydration...not just during the race but b/4 the race. You need to be starting to really hydrate yourself. Race conditions also play a roll in it. Extreem heat would make you more tired.2. Is how I felt yesterday and today - after running 20 miles - any indication of how I'll feel after 26.2 miles? Or does that extra 6.2 miles make the recovery that much worse? I felt pretty good yesterday and today. A little sore, but not as bad as I was expecting. I guess I'm just wondering what to expect for the day of and after the marathon. It would be great if I felt good enough to enjoy the parks.
), and he is great support. He has run a marathon before, so he's been helping me along this road - no pun intended. 
Good luck, and I'll see you out there on the course!
Julie--
As Christa and others have said, you'll be just fine. A 20 mile LR is pretty standard for the longest distance you'll cover in training. There are many reasons for this, one of the biggest is that training is always a balancing act between doing just enough and doing too much. A run much longer than 20 miles would require too long of a recovery period for most normal people, as well as walking the fine line of risking injuries. 20 miles sufficiently builds the physical and mental toughness required to finish the marathon, even if you're doubting yourself now. Trust me, EVERYONE training for their first marathon is scared of those last 6.2 miles. I won't lie, those miles are usually tough. Like everyone else has said, a lot of how you feel during those miles has to do with race day weather, your hydration and nutrition during the race, etc, etc. But.....just know that you have put in the training and you are ready. I have no doubt that you'll finish, and I know you realize that, too.
Steve
Hi Linda,
What great running weather today! Enjoy your run. I did 12 miles yesterday in the chilly drizzle, so no running for me today. I think I have 4, 3, and 8 milers to do this week. This tapering thing is crazy!
Thanks again for your insight. I feel really lucky to benefit from the experience of so many WISHers! 
