Three or more consecutive days off, however they came to line up.
A long weekend is a run of consecutive non-working days longer than the usual weekly rest. It is a consequence rather than a thing anyone declares: a holiday adjacent to the rest days, a substitution rule that moves one there, or a bridge day taken to join them.
It is worth naming because it is the unit people actually plan around. Nobody books travel for a Tuesday holiday; they book for the four days the Tuesday made possible.
For operations it is the shape that matters rather than the count. Three consecutive closed days across four countries that do not agree on which three is a harder problem than any single holiday, and it is the problem the window finder exists for.
The bridge day is the working day given up. The long weekend is what results.
A weekend is the ordinary weekly rest. A long weekend is that plus something.
See also bridge day · weekend · substitution · public holiday
We hold this as derived: consecutive runs of closure across the places on the board. See what we hold.