Minecraft advances all gameplay based on a unit of time called a game tick. There are 20 game ticks in a second which means that 1 game tick occurs every 0.05 seconds in real life.
20 game ticks = 1 second
When you are waiting for the time of day to change, fireworks rockets to explode, monster spawners to spawn the next round of mobs, a chicken to lay an egg, or baby animals to become adults, these advancements all occur in a certain number of game ticks.
How Long is an In-Game Day?
One full day in Minecraft takes 20 minutes which is 24000 game ticks (calculated as 20 mins x 60 sec/min x 20 ticks/sec).
When you first start a Minecraft world, the age of the world will start at 0 game ticks. As the number of game ticks increases, the time of day changes. For example:
|0||Start of Day 1|
|23999||End of Day 1|
|24000||Start of Day 2|
|47999||End of Day 2|
|48000||Start of Day 3|
|71999||End of Day 3|
And so on…
Congratulations, you just learned about game ticks in Minecraft.