If you mean this one https://en.wikipedia.org/wiki/1917_(2019_film) https://en.wikipedia.org/wiki/1917_(2019_film) it was many long shots edited to look like tw

If you mean this one https://en.wikipedia.org/wiki/1917_(2019_film) https://en.wikipedia.org/wiki/1917_(2019_film) it was many long shots edited to look like two continuous takes (there's a deliberate fade to black at one point). According to this (https://theasc.com/articles/lives-under-siege-the-goldfinch-and-1917 https://theasc.com/articles/lives-under-siege-the-goldfinch-...) it was filmed over four months.