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I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
Sure, but that still means you are not reaching someone by phone at work during 4 hours of you previously mentioned 8-17 Windows.
As someone currently working from Ireland with my usual office in Germany (laptop still configured this way) with a Team from India and DST ending next week, I would prefer to drop the calculations and just remember when each colleague approximately comes online. That is not the same for each colleague and day anyways.