How long does it take for first class post to arrive?

Related questions

1. Can I track my package without tracking number?
2. Can first class mail be tracked?
3. Is tracking number same as reference number?
4. Can a mailed letter be traced?
5. What is FedEx TNT?
6. What does the T stand for in TNT?
7. How do I track my xpresspost?
8. Is Royal Mail 1st Class tracked?
9. What is Canada Post Xpresspost?
10. How long does it take a package to clear customs in Canada?

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7. #longer
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18. #which
19. #before
20. #travel