I swear, I have played a lot and I still can't get some of the agents, not even the grind to even get out of unranked. Am I doing something wrong? Or do I really need 300+ hours to get all the agents?

I know it only recently left the shop, but how long do you reckon it will take for me to get another shot (no pun intended) at buying that Gaia's Vengeance Vandal?