For the past several years I have spent most of my train time running and photographing trains, occasionally creating scenes and doing scenery projects that were usually relaxing and relatively easy projects for me to do.
Occasionally, I will do a more intense project. When I do, I spend most of my train time working on the layout.
For instance, I recently re-wired my layout, which was a very demanding, challenging project for me. It was very physical, requiring that I crawl under the layout, and tedious (labeling, color coding wires, soldering, etc.)
Even when mostly running trains, my layout is prone to creating puzzles that need to be solved. I think this is a very good thing for me because of the mental activity involved in solving them. Examples of such puzzles include the non-derailing feature not working on an 022 switch, a locomotive derailing at a particular spot on the layout, a signal not working, a locomotive that stops smoking, an accessory not working, and perhaps the most challenging puzzle - the dreaded short circuit.
About 1 month ago, I had a very serious short circuit that took me many hours over 2 days to solve and much mental activity going through a long process of elimination. Solving the short circuit is what motivated me to re-wire the layout, which was a long term solution to avoid future short circuits and minimize the time solving them.
I'm very focused and driven when working on the layout; and relaxed when running trains.
Arnold