I found a pattern in most musical marrages. After seeing a few musical marrages I realized that the only time a character is marrying another character that they have dated for a long time is when they actually talk about it. Like, they would talk about how they dated this person for a while ect. Whereas if the character meets the character that they end up marrying, It is usually done by the end of the show to give the audience a happy ending. And the time between the dating and the marrage always fits in with the timeing of the show.
"If you try to shag my husband while I am still alive, I will shove the art of motorcycle maintenance up your rancid little Cu**. That's a good dear"
Tom Stoppard's Rock N Roll