Many trials only last a few days. In some cases, the material may be straightforward enough to be tried in the space of one day. On the other hand, cases that are more complex demand much more time. Antitrust litigation against IBM lasted decades, due to the very complex nature of antitrust law and voluminous documentation necessary to demonstrate relevant facts of the case.
A recent asbestos trial in New York was of this complex nature. Three construction workers had contracted mesothelioma as a result of their jobs. One worked as an insulator during the construction of buildings for Consolidate Edison. The second man was a steamfitter and worked on the construction of the World Trade Center in the early 1970s. The third man was an electrician.