If you report a post, how do you know it's progressing, whether it's resolved, or not? Mods can see your mail. Don't you deserve the right to even know the reason for acting on the report (if action took place)?
TLDR.
Read this guide to understand and use Report better.
[Unofficial Guide] Reporting effectively.Also, how long does it take to take action on a post? (Any max duration?)
It's up to moderator who is reponsible for that board or global moderator who see that report. Not max duration for handling reports and some reports are unhandled.
If you feel you can not wait, let's re report that post.