Aiming on Counter Strike:Global Offensive

So i started playing cs:go for about a year now, i didn't like it before cause of the spray patterns were so different from other games, but after watching Pro  League matches i started learning how it's supposed to be, and then i installed and tried again, and actually it's lot better, game physics are good, and it's extremely tactical, so i want you guys to answer, how long it took for you guys to master the aiming on this game? :Shaq: