The main story of Mafia: Definitive Edition typically takes about 10 to 15 hours to complete. For players aiming for 100% completion, which includes all collectibles and side missions, the time extends to around 20 to 25 hours. The game is structured into 20 chapters spanning the years 1930 to 1938, and the completion time can vary slightly depending on the chosen difficulty level and how thoroughly the player explores the game content.