Ignition key is hot - temp wise

I noticed the exact same heat related issue with my 1971 Duster 340. My car has the lighted ignition switch time delay feature when the door is opened. The light around the ignition switch area fades slowly over time, and then goes out.

If I drive my car for 1/2 hour or more the ignition switch area on the column gets progressively warmer with time.

Any thoughts and ideas on what's involved, how to diagnose and what the potential culprits are and how to cure would be appreciated.