Took me like one month and a half to finish Titan EX and I did it with the duty finder, I tried with those party finder groups that says always , kill exp required or if you die once kick and those were the worst in the other hand the duty finder group did a great job nobody died and also no pressure healing after plumes. Levi and Ifrit took me just one day. But I dont hate the fight I actually love it the problem basically its to find a good group but you probably know that already.