I just realized that I'll never achieve mastery on my feed mills. Feed mills x2 (5880hrs) vs. Smelter x5 (6180hrs)
Geez, with the amount of downtime I have on my feed mills I'll probably become a mother way before I achieve mastery. The early reduced production time of -5% and -10% for the 1st and the 2nd star actually makes mastery even harder. I don't really care for the -15% production time but I do want all my machines to be matching gold one day. Guess I'll just have to forget about that. ..

