What is the best length for YouTube video?

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Tags

1. #lengths
2. #still
3. #duration
4. #seems
5. #rules
6. #video
7. #minutes
8. #basically
9. #statistics
10. #seconds
11. #there
12. #content
13. #short
14. #reported
15. #online
16. #comscore
17. #length
18. #average
19. #youtube
20. #january
21. #range