Mayte Eme
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They have mass at noon and 6 pm on Sundays.
If you go to the noon mass, they open the doors around 11:50 am to keep tourists out and let the mass flow smoothly.
The place is beautiful, and the mass lasts about an hour. Just a heads up, during holidays, they don’t have the noon mass, and sometimes they cancel the 6 pm one too. The best way to find out is to ask taxi drivers - they know!