Oh, I don’t know, there were some very short engagements during wartime that led to long marriages. My parents had only a couple of dates and mainly corresponded via letters and their marriage lasted until death. My navy nurse aunt had a similar experience.
My grandma said that grandpa mailed her a check to go buy an engagement ring-I assume it was while he was in the service during WWII. They were married for over 60 years.