Filming isn’t the longest part of movie production. They spend a significant time editing, piecing stuff together, getting the audio and color balance right and so on.

https://www.adobe.com/creativecloud/video/discover/how-long-to-make-a-movie.html

For the average movie, the actual shooting of footage usually takes between one and three months. The time depends on the length of the script, but the going is slow. “One or two script pages will take a whole day to film,” says cinematographer Margaret Kurniawan.