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Q: My job takes me all over the world, and I’m thinking of getting a travel watch. How do they work? And do I really need one when my smartphone shows the local time?

A: No one disputes that travel can be stressful, so anything that simplifies the mind-numbing task of getting up to speed in, say, London, Shanghai or Fiji (lucky you) is a godsend. Travel watches, a category that has grown in recent years, let you track the time in multiple time zones. This can help peripatetic souls—or jaded frequent flyers—avoid missing…