Minecraft wiki entry for Hourly_clock, associated text: A 150-clock is what this writer and builder considers a full circuit, meaning it uses the max amount of repeaters needed. Set up the basic circuit from 4.1. Then put on a chain of 149 more repeaters. Then at the end of the circuit, make a wire branch off to one side, and attach 2 note blocks or sequences of note blocks. But, put an inverter before one of the note block sequences. As explained in 4.2, a clock circuit has 2 sequences, running in an endless cycle. So the inverter in front of one note block sequence makes it so that every 150 repeater run, on or off, powers a note block sequence. This method requires more materials and time, but is more rewarding when finished and more fun for showing off to friends or in videos.