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Adding working days to a start date skips weekends, so 45 working days from 2 February 2026 lands in early April rather than mid-March. A 15% contingency raises the estimate to 52 working days - about 10.4 working weeks. Contingency should be held centrally rather than distributed into task estimates, where it disappears.
Duration with contingency
days = base working days x (1 + contingency)
End date
add working days to the start, skipping weekends
Because contingency embedded in each task gets consumed by Parkinson's law. A central buffer is only drawn on when something actually slips.
No, only weekends are skipped. Add the holiday count to the duration or subtract it from available days separately.