Shops in the centre of Lisbon are open from Monday to Friday, until 7 or 8 pm. Some smaller shops also break for lunch from 1 to 3 pm, but the larger shops and chains won't take this break and will also normally open on Saturday mornings.
From 7 pm onwards, the large shopping centres and souvenir shops will still be open.
Museums and Monuments
The majority of the museums in Lisbon, such as the Archaeological museum and the National Coach Museum open from Tuesday to Sunday until 6 pm. Many museums close on Monday, and the opening times of certain museums may change depending on the time of year, so it's always a good idea to check opening times before arriving.
The most important monuments are normally open until 5 or 7 pm, depending on the time of year.