It depends on how many blocks you placed and how far you have traveled.
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minecraft can use anywhere between 256 MB and 512MB of ram on any system.
The Xbox Live Arcade says it is 113.21 MB
Minecraft shouldn't take more than 1 or 2 gigs of free memory if you are not doing much(example, mining, idling on singleplayer) If you are on a heavy traffic Minecraft server, or if you have a lot of mods, Minecraft could use from 4 to 10 gigs of free ram. If you are asking about hard drive, it can be around one half to one gig of hard drive space.
you have to go to start, click run, click your .minecraft folder, take the downloaded mod (it has to be zipped) click open archive, then with the .minecraft folder, you find bin go in, and open minecraft's archive, then you move the files in the mod archive folder to the minecraft archives. (some things might be wrong, but that's because i used pure memory to answer this, and i have a bad memory. )
It can take up to 2 mins it also dependes how much ram and memory u have left so if u have just enough it will take 2 mins if its first this you get 1 min or less if you want to know any more things about minecraft plz send a eamil brandon.scott74@yahoo.com.au latez