Image via Mojang AB
If you wonder how long 100 days are in Minecraft, the answer is close 33 hours of real time.
So if you’re trying to beat the Passing of Time achievement for the game, we highly recommend only playing for that full amount of time until the achievement unlocks for you.
You can also complete this achievement very efficiently by AFKing the game in peaceful mode for a few hours every day. However, if you use this afk method, make sure you connect your controller and make sure the game stays active for the allotted time.
Related: How to make black dye in Minecraft?
It may take a bit longer, but just playing the game will suffice and probably easier than leaving the game running all day to complete the achievement.
For other achievements like the Free Driver achievement, you will need to stay underwater for two minutesand the Castaway achievement, you will have to eat kelp for no more than two days.
If you want to complete this achievement, we recommend that you do so while trying to get the Passage of Time achievement. But for the Free Driver achievement, we recommend getting some water breathing potions.
Take a look at some of our other awesome Minecraft guides!