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How much space to I need to have available to install have Windows 7 x64, Windows 10, Office 2010, 2013 and 2016 (English), .net fixes, etc?

Would 128GB USB key work or should I invested in a WD My Passport Ultra 1TB drive?

Office: 3GB + 0,5 GB per language (x86) / 1,0 GB per language (x64).
About 1,5 GB per x86 OS & 2,0 GB per x64 OS.

All in all: 128GB should be enough for wsusou with all languages...