How many business days is it in a week (what days)?

Also if I pay for the item on a thursday and it says 10-20 business days what day would it be?
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There are 5 business days in a week. The days are Monday,Tuesday,Wednesday,Thursday, and Friday. The item would probably arrive on the second Friday after you ordered the item, but that is just a guess.
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business days = monday, tuesday, wednesday, thursday and friday,

so if you payes for something on thursday and you where to get it in 10 business days you would get it on a thursday two weeks from the day you bought it
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A typical business week is 5 days, Monday through Friday. 10-20 business days would be 2-4 weeks
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5 days monday to friday