No doubt these variables change depending on things like the country, culture, etc.
Never mind each person is unique in their emotions, personality, values etc.
They got engaged 12 days later—and stayed together for the next 55 years.
However, there was a negative correlation between post-engagement courtship and dyadic adjustment, indicating that, as length of engagement increases, marital adjustment decreases. In situations like that, the matter of how long they dated wouldn't come into play.
So, the closest you might come to finding any statistically predictable effect is that the longer a couple is engaged, the easier it is to adjust to marriage. Likewise, if two people dated for ten years and a spouse cheated three months or three years after the honeymoon, it wouldn't necessarily be surprising that they end up divorced provided none of the above conditions apply.
On the other end of this spectrum, only 6% of couples date for 8 years or more before getting engaged.
Though by a relatively small margin, couples in the South spend the least time dating prior to engagement.
But as we found, these numbers vary based on where you live.