The furthest is currently 1.8 x 10^308 blocks, which is just as many meters, before the XYZ coordinate counter reaches "infinity." However, it isn't limitless and the game stops functioning as playable on its own way before that point. Some content creators, like AntVenom above, have claimed to find new limits for how far they can travel once they start a Minecraft world. If the player can get far enough out, they'll reach a portion of the map where the game will begin to experience issues such as lag and crashes.
Each new Minecraft world on PC can theoretically go for a very long time, although it will likely break the game somewhere alone the way. It would be an interesting journey, thanks to the series of updates the game has received, diversifying biomes and adding new structures. Whether alone or with friends, completely mapping out an entire Minecraft world would be a seriously time consuming undertaking. Minecraft released in 2011 and quickly rose to fame due to its relaxing gameplay and the accessibility of the game on most hardware.
RELATED: No Man's Sky is the Blueprint on How to Do a Video Game Comeback Although that's pretty much where the similarities end, and even if both are large, the two games' maps aren't even comparable themselves. Both No Man's Sky and Minecraft also thrive on the feeling of exploration it gives players as they traverse across the unknown land, unaware of what dangers they may encounter. In both, players have to find resources to craft and make better equipment in order to get better resources and so on. What makes these games comparable, besides their sheer size, is that they are both open-world survival and crafting games. While other genres have tried to take the trophy, none have been as big as survival games. Over the last couple decades, open-world games have created some huge maps, but none so awe-inspiring as Minecraft and No Man's Sky. For as long as open-world games have been a subgenre, developers have been specifically trying to outdo each other with the size of in-game maps: Whether this be the size of the battle royale maps in games like Fortnite and PUBG, or in RPG games like The Elder Scrolls and the newer Assassin's Creed games.