We are coming to the end of the first season. Of the individual leagues, Group A has finished, Group B still has 2 games finishing, though both are in the late midgame, Group C has one to play out, D has finished, E has one to finish, and F has finished.
So that makes 4 games out of the 24 or 25 games to play out. I would suggest between 2 weeks and a month, depending on my group, Group B. This League has had more twists and turns than a snakes and ladders board! Honestly, with two games to play, anyone of five players could still win the League, and the second and third places are still very much up for grabs.