Build Machine Requirements for Ice Cream Sandwich
Saturday, March 17, 2012, Modified: Saturday, March 17, 2012 Refs

Ugh:

-6GB of download.
-25GB disk space to do a single build.
-80GB disk space to build all AOSP configs at the same time.
-16GB RAM recommended, more preferred, anything less will measurably
benefit from using an SSD.
-5+ hours of CPU time for a single build, 25+ minutes of wall time, as
measured on my workstation (dual-E5620 i.e. 2x quad-core 2.4GHz HT,
with 24GB of RAM, no SSD), 
https://groups.google.com/group/android-building/browse_thread/thread/3757b189f4e93df0/7355d4256bdf4906

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