Minecraft wiki entry for Egg_farming, associated text: Last of all, place buckets of water in each corner; they will flow to the central pillar. Load up your chest with eggs and/or lead in some chickens, and just hit the button. Then let the eggs accumulate until you have enough for a full run (at least a dozen stacks in the chest). (If you are starting with just a few chickens and/or eggs, an early run with just a few stacks can get you a few more chickens to fill the system more quickly.) If you have many eggs, you might want to do a longer run by disabling the despawn timer (add a lever to the block for its output torch), or just do a second run immediately when the first finishes.