The market hall building never formally closes, allowing the shops and stalls to stay open as late as the many shops surrounding the piazza. You should check individual stores’ opening times to avoid disappointment, but, in general, stores open around 10 am and stay open until approximately 8 pm. Larger stores are restricted by trading laws on Sundays which means they can only operate for six consecutive hours and therefore tend to open at either 10 am or 11 am and close around 5 pm or 6 pm.