Its not very logical, like this whole repair thing is not very logical.
There can be 1000 nobles with 10 men units and their eq would be repaired in 1 turn. But if there is 1 noble with 100 men unit, it will take several days to fix it.
Oh, and i have 4 chars, all of them has ~100 or more men units and 1 of them is at Thalmarkin and 1 them is at Perdan. and 2 at Darka.
So, this is not specific to Darka. It is overall very frustrating, cause there is definately more gold per noble around these days to use than it used to be. We sit and repair much more these. Ofcourse this effects everybody, but more and more people recently. And for big units and old chars, you cant even repair everyturn, cause you gain only 5 hours and minimum repair at KK's case is 5% and 6 hours.
-Jaune