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I rode the Dunwich Dynamo fixed a couple of years back, we finished in Manningtree which was about an extra 40 miles, plus an added 7 or 8 getting to London Fields.
It's not as hilly at 5500ft elevation gained, I rode an average 12.1 mph - So quite slowly.
I bonked cause I got sick of gels but other than that it was a good experience. 164 miles over 17 hours total and 13 1/2 moving.
I totally agree with @youramericanlover, you can definitely do it, it just may be slower / more conservative on the fast bits.
(edited: I cmd+entered prematurely)
I'm threatening myself with a fixed gear 200k this winter. It will be about 2x my longest fixed ride. The route is ~7,800ft elevation gain.
I know folks do much bigger rides fixed, but I'm curious about experience from people who do big rides fixed. Any thoughts or experience to share?