For determining resistance the important thing is the combination of the length and the thickness of the wire and, of course, the current it is required to carry. If you know the cross-section area of the wire you can calculate the resistance based on the resistivity of copper. There are online calculators.
With longer wires there is also a risk of cross-talk between the wires because longer wires will radiate more energy. Separating the wires from each other would deal with that.
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