How long does Ubuntu 18.04 upgrade take?

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1. #packages
2. #after
3. #internet
4. #ubuntu
5. #minutes
6. #previous
7. #obsolete
8. #entire
9. #speed
10. #installing
11. #process
12. #install
13. #asked
14. #depending
15. #system
16. #whether
17. #anywhere