Sundays:     One hour before each Mass.

Weekdays:  Thirty minutes before each Mass.

While Catholics may fulfill their obligation of attending holy Mass on the Day of Precept itself (e.g., Sunday) or in the evening of the preceding day (e.g., Saturday), Holy Mother Church reminds her children that "it is Sunday itself that is meant to be kept holy, lest it end up as a day empty of God" (cf., CIC 1248 §1; SC 73).