Hello why is my activity stuck at 14 while I am yet posting?
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Do some search if you care so much. Activity is not only about making posts ... 14 is max activity you can earn in 2 weeks. see:
Apparently , the activity changes every 1210000 units of the UNIX timestamp.
This equates to 14 days , 6 minutes , 40 seconds.
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It makes sense otherwise all members could become legendary very soon and it would completely lost the meaning.
Read
this for more details
Also why do I have to wait 360 seconds between each posting?
This is to prevent newbie from spamming. Obviously most of new users wants to quickly become high ranks so they can participate in sig. camps so flooding forum with useless posts ... but this is not why the activity was implemented ( it should reflect members experience, trustworthy etc. rather than post counts and willingness to participate in camps )