The best thing to do is try and beat the 8 Master Robots' stages in about 30 minutes or less and save your game on a separate save file. On Easy Mode, you can also save in between each of the castle's areas. As long as you advance normally, just killing those enemies that get in the way only and using the Robot Masters' weaknesses against them, you should get this with little effort. It'll take between 20-25 minutes to clear Wily's castle, so allow this much time in your run. The clock stops during visits to the shop, as well. I'm an average Mega Man player at best, and my BLUE BOMBER run ended with 51:24 on the clock. You can earn this trophy by playing as either Mega Man, Protoman or Bass.