Focus on the players that contribute the most to your team's success. In my case, it's mainly the AML/AMR. I power train them until the average skill level of each drill I want to train reaches 120 %, then I stop. Usually they reach 140 % naturally by the end of the season since they gain a lot of skill points through games.
I've developed a power training tool to help you out with the training. Here's a link if you want to use it https://forum.topeleven.com/tutorial...alculator.html