Borderlands 3 has roughly 30 main story missions. Keep in mind that the definition of a 'main story mission' can be subjective, and some might classify related side quests as part of the main story, affecting the total number you might think there are.
There are around 30 main story missions in Borderlands 3. But it can vary depending on how you play and if you include some optional ones.
In Borderlands 3, the number of main story missions is approximately 30. However, some players might consider certain side missions as integral to the main story, which could change the count depending on individual perspectives.