Cassie Marries Alex Fine One Month After Announcing Engagement

Cassie learned her lesson about long relationships that do not end in marriage.
She is officially married to Alex Fine.
The couple announced their engagement a month ago and are already married.
It is unclear when they got married. Cassis has not mentioned it on her social media and husband Alex was out getting Chick-fil-A on Wednesday.
The wedding photo was posted on the officiant’s Instagram page.
What is the longest a couple should be engaged before getting married?