Guess the Size of an Lrzip Archive of all Linux Kernel Sources Since 1.0

I've reported before about the efficiency of Lrzip. Now Con did a useful and fun thing: He created an lrzip archive of all the sources of all 2.6 linux kernels. And guess how much space it took? Update: Guess how big an archive of *all* Linux sources since 1.0 is.
A few hints:
- All sources in a tar are 10.3 GB.
- The 2.6.39.1 kernel is 73 MB as a tar.bz2 archive.
- Now it would be less, because the first kernel was smaller (just 32 MB).
- So taking the average (73+32=105/2=52.5) times 39 would be just 2GB (compressed!).

- 19,617,064,960 bytes linux-1.0-2.6.39.tar
- 11,067,473,920 bytes linux-2.6.0-2.6.39.tar

- ( 2,000,000,000 bytes linux-2.6.0-2.6.39.tar.bz) estimate
-   1,535,618,848 bytes linux-2.6.0-2.6.39.tar.xz 13.8%

With heavy, slow IO it took less than an hour to compress, and lrzip was more than twice as fast as xz.

Now that I gave you all these numbers let's see how much it really is... (make a guess an click the link)
Read more »