with happiness peaking after this amount of time away 是什麼意思

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Past research has suggested that eight days may be the ideal length of a vacation to maximize relaxation — with happiness peaking after this amount of time away. But a vacation of this length also comes with its drawbacks. You’re likely using up a large chunk of your paid time off (if you are even able to get away for this long), not to mention the expense of a trip of this length and the mountain of work that's likely piled up upon your return.