Sorry to disappoint you buddy, but my guild raids 2 times a week, 4 hours each and we reached top 200 as our first tier in Antorus, we are in world 100 who killed zek'voz due to killing him this Thursday, and we will start progressing Vectis tomorrow, which doesn't look like a hard fight really. It's very easy to be in top 100, you just have to be good. Now, for top 10-20? You need to be good, and also invest a lot more time than most ppl.