So a couple of my friends and I are making a puzzle/challenge based adventure map in the FTB ultimate pack. One of the challenges I have planned would require a 30 minute countdown timer. I'm not gonna make a full display for it (ill probably have lamps that shut off every 5 minutes but i'll worry about that later) I just want a system that when it gets activated by a pressure plate will output a redstone pulse after 30 minutes. I was wondering what would be the easiest way of doing this. I know in vanilla people use minecarts and cobwebs, or a crapton of repeaters. However, I figure with all these mods there has to be a simpler way to do this