What's the longest show ever?

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Tags

1. #running
2. #record
3. #holds
4. #currently
5. #simpsons
6. #aired
7. #scripted
8. #episodes
9. #gunsmoke
10. #series
11. #started
12. #western
13. #began
14. #years
15. #primetime
16. #radio
17. #surpassed
18. #longest