From the discussion of the release of the Linux kernel 3.10 on the Hubble:
xxx: ~60,000,000 lines of code, ~40,000 files, if you read 1 line per second 12 hours a day, you can read all the sources in ~5 months.
Children, what did you read this summer?
War and Peace!
Peter the First.
The Quiet Don.
The Linux 3.10 core.