A fortnight means two weeks
The word fortnight names a period of fourteen days. That is exactly two seven-day weeks. In fixed 24-hour units, 14 days equals 336 hours or 20,160 minutes. The calendar tool above advances the date by fourteen days.
A calendar example
A fortnight after Friday, October 23, 2026 is Friday, November 6, 2026. It is a calendar-date calculation, so a clock change during those weeks can change the elapsed hours.