How many 20 milers?

I didn't run this weekend so I had to make up my tempo run on Monday. My plan called for 2 miles at goal pace, 2 miles tempo, and 3 miles goal pace. I ran at the indoor track and was able to stay under 9 minute miles for goal pace and 8:00 and 8:05 for tempo. Yesterday I had a 80 minute run with hills. I ran on the treadmill and realized that I did not want to run that long so I split the workout up. I did the first 40 easy and did another 40 minutes last night. I did a Nike hill workout and my legs felt it, I was very tired and sore afterwards. Today was an easy 3 then I lifted. I was tired when I started but am feeling better now.

My training plan has me running only one 20 miler so I have been thinking about fitting in another. If I do I will have to run 18 this week and 20 next week, otherwise my plan calls for 16 miles this week and next. Does anybody know if I need two 20 milers or is one enough? Thank you for any information you can give me!

Long Run

Training has been going well, I had my first 15 miler yesterday. It was my first long run in a long time that I had to do alone so I was nervous. Running with someone really helps the miles fly by. I woke up to a blizzard, with a couple inches of new snow. I was not looking forward to running outside but I did not want to run 15 on the treadmill so I bundled up and took off. The first 2 miles were horrible, my achilles were so tight and the road was uneven with the snow. I ran around my house and was ok when I was running with the wind but 5 miles in I had to run against the wind and my cheeks were freezing so I decided to finish on the treadmill. I came in at 6 miles and my cheeks were white, I changed into some dry clothes and jumped on the treadmill. I managed 9 more miles, very boring on a treadmill! Afterwards I took an ice bath and felt good the rest of the day. Today I ran 5 easy miles and my legs are tired, thankfully tomorrow is a rest day.