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This article suggests an efficient dynamo will cost you up to thirty seconds over 100km when switched off and up to nearly six minutes switched on.
Agree with @hippy's point about one less thing to think about, there is a bit more stress with batteries. There's also a little bit more bulk if you are really short of space, and a bit more hassles if it rains to keep stuff dry.
But I think the gains are bigger. Those articles aren't written with ultra racers in mind. The power output for most of us is lower, after a couple of days, so losing 6 W when you're only putting out 80W is more damaging.
But even on those numbers, 6 min per 100km is 5.5 hours, or 100+km, so still worth having. (It's an autumn ride so quite a lot of dark, + gadgets, means people with dynamos would use them most of the time).
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frank9755
@Scilly.Suffolk
Would something like what HED do be an idea: ie alu rim with a carbon fairing.
Using rechargeable batteries seems like the worst option to me: you're reliant and dependant upon being able to charge them.
This article suggests an efficient dynamo will cost you up to thirty seconds over 100km when switched off and up to nearly six minutes switched on.
I suppose it depends on how long and where you intend to stop: if charging, I'd think you'll need a better planned and more rigid schedule. A dynamo would give you more freedom to alter your plans on the hoof.
Either way, congratulations on getting a place and props for doing it fixed (you can't back out now)!