As of my knowledge, the duration of the Staropramen brewery tour in Prague typically lasts about 90 minutes to 2 hours. It is essential to note that tour durations can vary based on factors such as the type of tour you choose (standard or premium) the size of the group and any experiences or tastings included in the tour package. To get the most accurate and up-to-date information regarding the duration of the Staropramen Brewery tour and to make reservations I recommend visiting the official Staropramen Brewery website or contacting them directly. Brewery tour durations and offerings may have changed since my last update so it is always a good idea to verify the details before planning your visit.