I've signed up for my first Ultra (Chilterns Challenge 31 miler in July). I've read a lot of training plans, and I must admit, they're very scary! Most of them recommend 5 runs a week and 40miles/wk at a minimum.
I can only find time for 2 or max 3 runs a week, mostly a 15-18 mile long run on a Sunday and then one or two 5-6 mile runs in the evenings after work on about 50% trails. Last year I did my only marathon and I had a very similar training profile, which was about half the total mileage the training plan demanded, but I finished comfortably with 4:12. I'm definitely not after speed, just the experience!
So formal training plans aside, how often and how far do you real ultra runners actually manage to run on a weekly basis ahead of a race?