An audio guide that lasts for 3 days and is structured in a way that you could complete it in one go. However, visiting all the noteworthy museums in that time would be challenging. For Lisbon, it is advisable to purchase a public transportation ticket to move around more flexibly and quickly. The guide will point out these options at the appropriate times. If you prefer to mostly use tram 12 or 28, you can also start the tour at Praca Martim Moniz (Waypoint 20). The guide will then direct you to the relevant stations, and you should arrive there early. For the Castelo de Sao Jorge, plan your tour so that you arrive early or purchase the tickets online in advance. The Portuguese terms are pronounced in a way that even non-Portuguese speakers can easily understand. By the way, there are similar compact tours available for Bremen, Gdansk, Krakow, and Wroclaw.