RFTools Timer
The timer is a simple gate that will repeatedly send a redstone pulse. You can input any value for the delay so it can be used for very long timeouts.
What is special about this timer is that it restart when it itself receives a redstone pulse at its input. So given timely input pulses this block will never output a pulseitself. By using this feature this block can be used as a way to detect that a certain activity is overdue.
You can craft this block with the following recipe:
