Calculating a Deadline That's a Set Number of Business Days Away
Count forward one weekday at a time from the start date, skipping every Saturday and Sunday, until the target number of business days is reached — the result depends on which weekday the count starts, since it determines how many weekends fall inside the span.
"10 business days from now" sounds like it should be a fixed amount of calendar time, but it actually varies depending on the day of the week you start counting from — walking through it explains why.
A worked example starting on a Wednesday
Starting the count on a Wednesday: Thu, Fri (2 days), skip Sat/Sun, Mon–Fri (7 days), skip Sat/Sun, Mon–Wed (10 days) — landing on the Wednesday two weeks later. Two full weekends fall inside this 10-business-day span, adding 4 calendar days beyond the 10 counted business days, for 14 calendar days total.
The same count starting on a Friday
Starting on a Friday instead: skip the weekend immediately, Mon–Fri (5 days), skip a weekend, Mon–Fri (5 more days) — 10 business days lands exactly 2 calendar weeks later too, but the specific weekday pattern of which days get skipped differs, which matters if a deadline needs to reference a specific day of the week rather than just a count.
Why the starting day changes the outcome
Because weekends are skipped entirely, the position of the start date relative to the nearest weekend determines exactly how many weekends fall inside a given business-day count — this is why the same "10 business days" instruction can land on different calendar dates depending purely on which day of the week the count begins.