I initially got the idea after watching the famous Mike Holt video on grounding.
Mike warns that longer wires to ground rods can attract more energy. So I thought he meant the lightning voltage can increase after passing through the wire (it doesn't as one of the Answers has detailed at length).
I have many surge protection devices which protect many circuits so I wanted to know the mechanisms of it. And I tried to review the physics below:
Given the inductance for a given length of wire, the induced voltage along the length is given by:
So the greater the rate of change in current, the greater the induced voltage.
Hence the longer the wires. The greater is the surge voltage.