Let me see if I understand this correctly.
In order to maximize your activity count, you need to make one post a day OR 14 posts exactly every two weeks.
No... to be active you have to log in at least once every two weeks. To maximize activity, you must constantly be active (log in at lease once every two weeks) AND have a post count greater than or equal to the number of days you have been active.
It doesn't matter when you get your posts. You could for example log in every two weeks for two years and not post anything, then post 730 times in a week. This would put your post count and activity at 730.
This can't be true. I have tons of hours of being logged in and I have had some 2 week periods where I posted hundreds of posts and I don't think I have ever gotten more than a couple dozen activity points.