Quote from WoeUntoYou
That's in a completely straight line going one direction on a flat terrain with no hunger. With terrain and hunger, it will take a lot longer. Take kurtjmac's Far Lands or Bust as an example of how long it takes to get far with terrain, and then add the time that you'll spend dealing with food, which takes more when you're constantly sprinting. Probably would add a good 20 days (too lazy to do the math myself like I was last time). Either way, 80 days is still a really long time. 80 x 24 = 1920 hours. Obviously you're gonna have to sleep in real life, and I doubt you'll be playing the whole 16 hours you're awake. Considering all that, it will take you a year, maybe two, to get to the end of the world. (guess I misquote the 24/7 part).
You can set the ground rules for how to reach 30,000,000 any way you want. I was considering a player moving on autopilot in a flat world. Hunger and monsters will slow you down obviously. It may be statistically impossible to reach 30,000,000 blocks on hardcore survival, given the slim odds you have that you won't die before you reach that point.
I was curious how much terrain would slow you down (on creative, no flying or digging through mountains). I created a random map and starting running in one direction for 20 minutes, and reached 5351 blocks, or 4.46 blocks/sec. That seemed kind of fast, until I realized I jump while running. Jumping while running is faster than just running, to the tune of 7 blocks/sec. I also did not encounter an ocean, which slows you down to the tune of 2 blocks/sec. Since oceans are rarer in 1.7, maybe I'd expect them to be 20% of my journey, which would slow me down to roughly 4 blocks/sec over terrain if we factor that in.
If someone were to pay me money to reach 30,000,000 blocks as fast as I could (on creative mode, without flying, normal terrain), I think I could handle it without going insane for 14 hours/day. That's 201,600 blocks/day, or 149 days to reach the 30,000,000 wall.