I've read these threads enough to know better than to post one without proof reading the subject. When I saw that typo, I expected to find 3 pages worth of very creative, entertaining, skewering posts when I returned here today. Glad to see that despite my sticky T key, folks still posted some genuine responses.
Hospital, that's true. The best 5K I've managed in the past two years is 19:45, and although I do interval work, I have a hard time stringing together a meaningful number of repeats faster than a 6:00 pace, even at distances as short as 600 meters. Intervals tend to be 6-8 1K repeats at 6:10-6:15 with 2 minute rests. Tempos tend to be run at 6:50-7:00 at distances of 4-7 miles.
I'm no more competitive at longer distances, again usually finishing in the top 20%, but out of age group placing. However, I find longer distances more enjoyable. Yes, the suffering lasts longer and is more intense, but it's a smaller fraction of the overall race. A 5K stops being fun before the first mile is even over, whereas a half marathon is enjoyable for the first 7-8 miles and a marathon for the first 15 before things begin to slowly deteriorate. From what others are saying above, it sounds like an ultra continues this trend. 35 miles of enjoyable running sounds like a good time (we'll just put the last 15 out of mind for now). Also, 5K's are over too quickly, whereas I feel like I've accomplished something meaningful after completing a longer race. So going longer and trying an ultra seems like the natural next step.
The running theme in these responses appears to be to respect the course as pointed out by UK, Concord and Stressed. I train on gently undulating courses (both trails and roads) that constantly give and take back elevation changes of up to about 300 ft, and I tend to select races with a similar or easier elevation profile. So there are no mountain races on the calendar for now. The two ultras I'm leaning towards are the JFK and Le Grizz neither of which look like ball busters. The first offers an abundance of aid stations and support and the second, an inspirational setting.
For long runs, I carry 20 oz of Gatorade and several GUs in a fuel belt and during races my appetite stays healthy (hitting water stops and consuming Gus) until I begin to deteriorate at which point I forgo the stops and just focus on finishing. Not sure if I can get away with this for the last 15 of an ultra with the less intense pace or if I'll need to consume calories even when my stomach is feeling green.
Plugging my half marathon pace (7:00) into a pace predictor calculator yields a pace of 8:15 for 50 miles, which extrapolates well from my paces of 6:20 for 5k, 6:40 10K, 7:00 hm and 7:40 m. Unless convinced otherwise, 8:15 will be my target entering training. It sounds like much of the advice I've been reading on the web is geared towards the more casual runner whose goal may be to just finish 50, and from what I'm reading here from the more experienced crowd is that running 50 (with the exception of steep hills) at a reasonable pace is doable.
It doesn't sound like there's much experience here though with including back-to-back weekend long runs as the backbone of a training program. I may give this a try along with a mid-week short tempo or 5K race to keep the legs sharp after recovering form the weekend.
Thanks for the input. See you on the trails.