https://bitcointalk.org/index.php?topic=237597.msg2513302#msg2513302The meat:
Rough summary of what this means: If you post once per day on average, then you will eventually get the maximum number of activity points that you can get. Posting more than once per day on average is useless for increasing activity. The maximum number of activity points you can get is 1 per day, but your activity score only updates every two weeks. Therefore, it will take about 100 days to get 100 activity if you post once per day on average.
Hope that helps.
Thanks a lot. activity=min(time*14, posts). I have registered 12 weeks ago, so it seems that I could post more often than 1 post a day, and get 84 activity level after 84 posts, and then it will go slower