Det förklarades inte i filmen, och det förklaras inte heller i källans roman (förutom att det är inte förklarat )
CORALINE’S PARENTS NEVER SEEMED to remember anything about their time in the snow globe. At least, they never said anything about it, and Coraline never mentioned it to them.
Sometimes she wondered whether they had ever noticed that they had lost two days in the real world, and came to the eventual conclusion that they had not. Then again, there are some people who keep track of every day and every hour, and there are people who don’t, and Coraline’s parents were solidly in the second camp.