Rank            Required activity   Required merit
Brand new             0                       0
Newbie                 1                        0
Jr Member             30                      0
Member                60                     10
Full Member          120                    100
Sr. Member           240                    250
Hero Member        480                     500
Legendary             775-1030             1000


Activity is calculated with the following formula:
Code:
activity = min(time * 14, posts)

Activity is increased by staying logged in or by posting and is updated every 30 minutes. There is a maximum of 14 activity points every 2 weeks.



The above is the most direct answer. Hope to help you!