The undead dragon is abou 3600 blocks away from spawn. First off endurance mode is a gamemode where you have to kill the undead dragon to beat it. Traveling in endurance mode is hell and it is the main reason why it takes so long.
Friends and communication because this game mode requires teamwork and playing alone is super hard and can take even longer then 4 or 5 hours. Lots of time because this can take 4+ hours to complete. Hope this helps the noobs and maybe some experts. If you have any other tips that you would like me to add please just leave a comment. Recomend this game to people who need a new cheap but awsome game. Having friends to play with is very fun. You can use the teleport function in many siutaitions to save yourself. Sandbox mode requires you to gather resources but once you have it you have unlimited. When mining blood stone in the overworld be carefull as falling could be a result of death. Killing the first dragon that spawns is fairly easy, you just need about 3 clips from a regular Assault Rifle.(Shoot ahead of the dragon as bullet physica exist). Do not go in a alien biome unless you want to die (Bring some Blood rifles and shotties). Making basses and tunnels to different biomes is a smart way to travel. Alien Biomes are found randomly throughout the world. Be careful though because enemies down there will do lots of damage to you in great numbers it is relatively easy to get down to hell by making a ladder around the Tower. Bloodstone, diamond walls, space goo and space rock cannot be destroyed by dragons. Diamond Axes are actually pretty effective weapons, they're more durable than Bloodstone Knives but weaker. Its just a waste of resources (Unless your rich) Play on endurance to unlock achivements as this is the only possible way to do so. You can use your ps3/ps4 remote to play the game. Your reward is not that good for how much ammo you will waste (Unless you have blood stone or a space weapon). Dont just swing your pickaxe at random things because each time you hit is a -1 on the usage of the pickaxe.