The recommended length presentation is 6-9 minutes at most (including short videos)
It is recommended to choose meaningful images and arrange them in chronological order.
Another thing that can add interest to your presentation is the arrangement of pictures by topic: Photos infancy early days, pictures with smiles, photos with friends, hobbies, travel, funny pictures, moving images, family photos, special photos, close-ups, photos album and more.

If you want to edit recommended wedding slideshow with a perfect length click here