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an extremely long time. business weeks being a time frame used as a shipping time estimation, i.e. your package should arrive in 6 to 8 ..
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The following numbers ARE Numberwang: 1, 22, 7, 9, 1002, 2.3, 15, 109876567, 31 etc.
And these numbers are NOT Numberwang: 1, 11, 7, 9,..