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I've seen that one before, I think that was where I got the dynamo drag numbers from. And they come up with similar figures to my estimate on the time loss from using a dynamo: 2-4 hours over the TCR.
Obviously it depends how much of the time you have it switched on for.
The other factor is that it makes more difference for slower riders (ie most of us after the first 2-3 days!).
@frank9755 - might be of interest
https://www.cyclingabout.com/dynamo-hub-drag-lab-testing/