1 week is 1/52 of a year
so one answer might be .019231
Other answers might be better, but it depends on what you mean.
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As in the question: "40 hours a week".
They are called Shiv'at Yemei Bereisheet- the Seven Days of the Beginning.Commonly, the Creation week. For 6 days God renewed the face of the Earth all prepared for mankind. On the 7th day, God rested and blessed the day for all generations to rest and ponder His great creation. Having established the 'week,' God gave it to mankind for a chronological tool/cycle.
2/7 of a week would be two days since a week is seven days, two 'parts' of a week would be two days.
The days of the week would be different in different languages.