Training for first Ultra/ultras

Most people don't run the full distance in training even for a marathon.  The 50K will be similar to the marathon, 5 more miles (but usually off-road). 

I did a few 20+ runs with the longest being 28 miles leading up to my 50-miler.  My buddy who did the 100 would do the 20+ with us on Saturday and then another 10-20 on Sunday.  That's probably about the most anyone would have time to run and still lead a "normal" life. 

I posted this in another thread, you can use as it as a guide.

I came up with based on my own recovery rate and based on well I was responding from each workout to ensure I was not loggin in junk miles. This priciple is the same if I am running a 50 or a 100 miler. I believe in doing back to back long runs on the weekend.

this is all based on time
2 day back to back total run mileage should be arund 45% of weekly mileage
day 1 of b2b should be around 55-60% of 2 day volume then making day 2 around 40-45% od weekend volume.

Here is a little gee-whiz in regards to pacing...

What I learned from running a 100- 2 weeks ago when I finished 15th out of like 280 in 21 hours I still walked around 40 out of the 100 miles. I paced 3 min run and 3 min walk from the start through 50 miles. After the half mark I went to 6 min run 3 min walk through 91 miles then ran last 9 into the finish.