Ah. 8 hours sounds like a long time :)
It's good if that estimate is working for you, your times might just be roughly the same as how he came up with it. I find it more a frustrating generalization for slower runners, because it simply isn't accurate.. it can't be because your overall pace it determined by how often, how long, and how fast your walk breaks are. I calculate how fast I need to run, versus the overall pace, because then I can do my short runs, which are about 6.5 miles, at that pace so I know what it feels like. So, in your case you did a long mixed run at 11:58 and a long straight run at 10:15. That's a difference of 1:43...so I guess I'm confused as to how the 20 seconds works for you. Have you done a walk/run at the 10:15 length and found it at about 10:35 pace? The other thing I try on my long runs is to do a constant pace, or even a negative split, so my 10 mile pace is identical to my 16 mile to my 26 mile.
What I mean by walking pace and why it matters is this: say you are running 10 min. pace, and doing a 3:1 interval. If you're doing a 15min walking pace,then in 4 minutes you cover 3/10+1/15 of a mile. You can calculate how many cycles (including fractions) you need to cover 26.2 miles and it will give you estimated finishing time. If you're going for a time goal, on the other hand, you can solve the equation for the necessary running pace and do your short runs at that pace. If you do a few of those calculations, you'll find that the overall pace varies significantly depending on those factors, meaning well beyond 20-30 seconds/mile.
In any case, sounds like you're going strong. Have you tried using the 5k estimation time for the marathon and done some distance at that pace? If I recall correctly, for your 9 min pace, that would estimate your marathon time at some just shy of 4:40.
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