I just worked out that if I keep posting at the rate I am now, which is roughly 15 counted posts a month, it will take me 5 years to get premium. Either I'm slow as shit or I can't math at all.
So in two and a half months, you were able to get 58 posts. 58/2.5= about 23 posts per month You need 1000 to be premium, meaning 942 posts to go. 942/23 = about 41 months to go, which is actually 3 years and five months