Tick

Nearly all video games (including Minecraft) are driven by one big program loop. Just as every gear in a clock is synchronized with the pendulum, every task involved in advancing a game simulation is synchronized with the game loop. Appropriately, one cycle of the game loop is called a tick.

Game tick
Minecraft's game loop normally runs at a fixed rate of 20 ticks per second, so one tick happens every 0.05 seconds. An in-game day lasts exactly 24000 ticks, or 20 minutes.

However, if the computer is unable to keep up with this speed, there will be fewer game ticks per unit time. As the vast majority of actions are timed based on tick count rather than on wall clock time, this means that many things will take longer on a slower computer.

On each tick, various aspects of the game advance a little bit: moving objects change position, mobs check their surroundings and update their behavior, health and hunger are affected by the player's circumstances, and much more.

One thing that does not happen as part of a tick is drawing graphics. Rendering happens after updating. This is why there can be a variance in fps (if vsync is not enabled) but the tps (ticks per second) will stay constant. This prevents video performance from affecting game mechanics, and vice-versa.

Note that a multiplayer server may be "slow" at initial startup; this is partially due to the java virtual machine taking longer by default to optimize java code at runtime.

Chunk tick
o change state and water will schedule a tick when it needs to move. A scheduled tick and a random tick may do different things on the same block.

Tick刻 Each full Minecraft day is 10 minutes long, if you know how long a tick is (I believe one tick= 0.1 seconds, but I'm not %100 sure.) then you can do the math from there as I am to lazy at the moment. k https://minecraft.net/en-us/