You can earn up to 14 activity points every 14 days. Those points could be earned in one day, i.e. registration at 01.01.2018 --> making 14 post gaining 14 activity --> rest until 01.15.2018 --> making 14 post gaining 14 activity --> repeat. I think that hits the point.

Though i do not advise to act so since the quality of your posts would probably be bad. One post a day is perfect.