How long should pictures be on slideshows?

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Tags

1. #means
2. #minimum
3. #which
4. #watch
5. #slide
6. #pictures
7. #story
8. #images
9. #translates
10. #image
11. #photos
12. #seconds
13. #reason
14. #minute
15. #great
16. #depending
17. #minutes
18. #setting
19. #people