Travel time would not matter as every team only plays out-of-division opposition twice. From that perspective, it makes no difference if the Lightning and Panthers are in the Atlantic or Central. In fact, based on the map, every team but Winnipeg would be closer than their current division opponents.
Moving the Avs back to the Pacific doesn't change the timezones, as it would remain Pacific and Mountain. Moving the Florida teams to the Central doesn't change the number of timezones. It just goes from Mountain and Central to Central and Eastern.
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