But as long as the house is fresh, it can be eaten within a few days of being assembled. If it sits around for a week or more, it will be stale. Then you can wrap it up carefully and take it out again next year, strictly for display.
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Properly sealed and protected, you might be able to keep a gingerbread house looking good up to a year. If you are okay with making your house a non-edible creation, spray it with a clear lacquer, which is available at craft and hardware stores. You might need several coats for maximum protection.
Making gingerbread houses is still a way of celebrating Christmas in many families. They are built traditionally before Christmas using pieces of baked gingerbread dough assembled with melted sugar.