I have looked at hundreds (maybe a thousand by now) of marriage dispensations in Guadalajara and can add that the vast majority of them were executed about three to five weeks before the marriage took place.

However, I have seen several dispensas that took place months even years after the marriage. This happened after a witness or family member revealed that the bride and groom shared a blood or affinity relationship--or when other family members married and new information was revealed during THAT pre-marriage investigation. In such instances, the priest had to go back and take statements for a marriage that had already taken place.

I hope this helps.
-Claudia
www.guadalajaradispensas.com