Estimate the size of extras ?

[David Timms]

I have been talking about getting extras mirrored with some local mirror 
admins and was asked what space would be required for an extras mirror.

My guesstimate is:
one extras version ~2GB
   - currently two active versions
two/three architectures:

Hence about 2GB*2*3 = 12 GB.

Would someone know a more realistic answer, or could run du -sh extras/* 
on their mirror and post back ?

Thanks, DaveT.