@Reza: yw ;)
@Plat: not so simple. There are two things.
---- This series is a neverending series, with continuous Ranking which based on the last 52 weeks results (and not really weeks but events, I mean when a new year event finished it replaces the last year corresponding event's results, so those are expired).
You can see this Ranking in the first post of this topic, and the first TOP10 picture too in my monthly posts. So as you see, this one doesn't have start nor end, you can join anytime and need one year for the maximum possibilities (i.e. you can play all the 50 events). But of course if you win all events you joined, then need less then half year to reach number one position ;)
---- And there is an other Ranking too, it is the Race. It is another and not :) I mean another, because the Race has a start time when the first event started (first Monday of the year), and has an end time, when the last event of that year finished. This is not an exact date, because we don't know when the players finished the tourneys. It is about next year March.
And I mean not another Ranking, because it is based on the same events and same method than the normal Ranking. In the tennis, where the events have exact start and end date, the two type of the Rankings will be exactly the same in the end of the year, because end of 2018 will be only 2018 events in the normal and the Race tennis Rankings too. But for us, it is not possible, because a 2019 AWP event can finish earlier than a 2018 event for example (and that 2019 event will be counted in the normal Ranking, and counted the new year (2019) Race but not in the 2018 Race)
Uh, I hope I can describe it well :O
Hmm, I link the ATP Tour FAQ, because if you understand how that works you will understand this one too ;)
https://www.atpworldtour.com/en/rankings/rankings-faq