The difficulty of fantasy games depends on your knowledge of the given sport. To excel at fantasy sports requires good strategy and yet, winning big and consistently is difficult as the real-world results are unpredictable.
Fantasy sports is very competitive, as like-minded fans go against each other. Playing fantasy sports games requires one to have apt knowledge of players, their stats and current form, playing conditions and so on.
Depending upon the fantasy player's inclination to research, fantasy games can take up more time in seeking in-depth analysis of a match. It also depends on how many matches or leagues a player is participating in on a given platform.