My Newbie status turned Jr. Member in between of the 2 week period, so the rank can be given at any moment after you reach the activity requirement as long as you have the potential for the rank but lack of activity
I will try to explain for you what I understand from your sentence.
All the ranks are well defined except for legendary. For example, someone will become junior member once he has 30 activities, for member it is 60, for full member it is 120...etc except for legendary it is limited between 775 and 1030 activities.
And you can pass the next rank when you achieve the required activities whenever it happens not necessarily in the first day of the period.
Finally got it at 910
Was starting to think, I'll be among the users that got it in the end...
Congrats
Apparently i know someone (<--) that will join the desperate line queue for a long time
Edit :
You only get to complain once you're over 900.
I started to stress from 775 activities
and good luck Lutpin & LoyceV