How often is PubMed updated?

Related questions

1. What is PMC Journal?
2. Is PubMed same as Medline?
3. What is the difference between Google Scholar and PubMed?
4. How many articles are in PubMed?
5. Is everything on PubMed peer reviewed?
6. Is PubMed legitimate?
7. What are PubMed articles?
8. Is PubMed and Medline the same?
9. Is PubMed Medline?
10. What is the meaning of peer reviewed journals?

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8. #updating
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11. #saturday
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15. #welcome
16. #medline
17. #daily
18. #prior
19. #licensees
20. #change
21. #updated