I have lost patience for anime that goes beyond about ~52 episodes, with some exceptions. If I see that it goes beyond that, I will need a good and compelling reason to continue. This naturally excludes a lot of popular shonen anime. However, I have not really seen much that has persuaded me that many are worth watching for that many episodes for what feels like so little actual story content. There are so many episodes and arcs in these series that just DRAG while meandering aimlessly in protracted fight scenes and poorly paced plots! Give me an anime with a good beginning, middle, and end within the span of 13-52 episodes! I just don't have the time or patience for anything beyond that scope.