So, when we get to the level stated on the side is when we can go to that monster and train safely without worrying about our equips breaking. Add 19 to the level on the side tell me the level of the monsters? (most of that I get). What I don't understand is how long we can train on said monster efficiently and when we should stop training on that monster.

Take the Magic: The Gathering 'What Color Are You?' Quiz.