Definition
Calendar days count every single day (weekends and holidays included), while business days count only weekdays. This distinction significantly affects contract deadlines.
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Calendar days count every day: 10 calendar days from Monday = 10 days regardless of weekends/holidays. Business days count only weekdays: 10 business days from Monday = roughly two weeks (weekends excluded). Real estate contracts frequently use business days for inspections, appraisals, contingency removal to avoid weekends interrupting progress. Using business days prevents: inspection deadline falling on weekend (inspector unavailable), appraisal contingency deadline during holiday (appraisers closed), deadlines forcing weekend rush. Example: buyer has 10 business days for inspection; if 10 calendar days, inspection deadline might fall Saturday (impossible). Business days are typically more favorable than calendar days. When contract specifies days without clarifying business vs calendar, courts typically interpret as calendar days. Precise language prevents disputes: '10 business days, excluding state holidays' is clear; 'ten days' is ambiguous.
Pro Tip
Ensure critical deadlines are business days, not calendar days. You don't want deadlines falling on weekends.
Example
10 calendar days from Monday March 2 = Wednesday March 12. 10 business days from Monday March 2 = Friday March 13 (weekends excluded).