The schedule works exactly as policymakers intended with no individual or company able to depreciate more for a general aviation aircraft than any other capital asset.

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While 15-hour days in the kitchen are no longer the norm, Cheng still works a heavy schedule, dropping in on two of his restaurants every day to make sure things are going smoothly.

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Valve works on its own schedule, always.

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Mr. Minoff said he still works long hours but he likes that he can tailor his schedule to his needs by, for instance, sleeping later after an all-nighter.

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Others argue that kind of timing works in the tech sector, where workers often set their own schedule.

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Works started in spring 2011 and are on course to be completed one year ahead of schedule in 2015.

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Every three or four months, Lang halts his impossible schedule and goes to Berlin for ten days or so and, in relative isolation, works with Barenboim.

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