I use GMT watches often, so perhaps the reprogramming is less? It’s only one nudge forward to have both zones on 24hr scales.
Although I’m in the U.S. and not amongst the professions that regularly use 24hr clocks, huge blocks of the world use 24hr time, as do various professions requiring unambiguous time coordination (e.g., medicine, aviation, etc.) - so I’m actually surprised we see so few 24hr dials/movements.
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