1 and 2 iterations are easy-peasy compared to 3 D: Wanna do a 4 iteration? It'll be big... 81x81x81 big. You do realise a 4 iteration would hit the skybox. Rather not have that.
1) Best game I ever played 2) Second best game I ever played 3) Third best game I ever played 4) Fourth best game I ever played 5) Fifth best game I ever played All open to interpretation. They're probably in the list on this page.
That's because 1 block travelled in the Nether is equivalent to 6 blocks in the real world. I haven't even been to the Nether yet, I need to find one more diamond so I can mine some Obsidian. 1 block in Nether = 16 blocks in surface world.