The restaurants on the long side of Markthal which have their own entrance also have their own opening hours. These opening hours can be found here.
DIFFERENT OPENING HOURS ALBERT HEIJN:
1e Xmas: 25/12 : 10:00 - 19:00
2e XMas: 26/12 : 10:00 - 22:00
End of year: 31/12 : 09:00 - 18:00
New Year: 01/01 : 11:00 - 20:00