Depending on the completion of the main objectives only, Grand Theft Auto 5 is about 31.5 hours long to get its full story told. As a gamer who wants to experience and excel in all aspects of the game, you will probably spend around 79.5 hours to have 100% fulfillment. The game has 69 missions based on the storyline, 14 random events, 20 missions called freaks and strangers, 42 pastimes and hobbies, along 16 diverse tasks.