Assuming you're trained for the distance, the average person's best pace for twice the distance is 4-5% slower. (i.e., if you run 10.76 min. miles for a distance, you can do about 11.19 - 11.3 minutue miles for twice that distance.
Based on your half times, that puts you right around 5 hours for the full.
You also could use one of the calculators and your times at shorter distances to confirm that 5 hours is the right target range. It would help my confidence if it was close to the other prediction. (but the half times are probably the best predictors and having two of them rather than just one should give you more cofidence that you can do it)
Oh yeah, and I'm glad to see that I'm not the only one who deals with partial minutes as fractions rather than seconds.
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