It uses about 10 megabytes per hour if playing on downloaded version but when playing on the website version it takes about 20-30 megabytes.
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Between 19.45 to 25.46 mb
minecraft can use anywhere between 256 MB and 512MB of ram on any system.
This all depends on your maps. A copy of Minecraft that has no started maps is around 228KB. But after you start playing this will go up.
The Minecraft Launcher is 263 KB while the Minecraft folder is approximately 46 MB.
The download for Minecraft for the PC is around 300kb. Installed, it will be approximately 30 - 40 mb depending on how many save files you have. It is not any bigger than an audio CD.