Love, Daisies and Troubadours - S1-E21
Continuity mistake: When Lorelai tries to remember the name of the guy who used to run the auto-body shop, she opens the kitchen's back door in the interior shot, but in the next exterior shot Lorelai is walking out of the side living room door, with the window beside it. (00:06:15)
Chosen answer: Lorelai and Christopher get married impulsively in Paris but they get divorced shortly after returning home. I don't know the exact number of days or weeks but they definitely weren't married for more than a couple of months.