What is the largest Linux distro ?

Gentoo:
eix -c | wc -l
13512

Debian Sid (I wish I found something more efficient. I include Marillat repositories.):
$ time bash -c "apt-cache pkgnames | xargs apt-cache showsrc | grep Package: | sort -u | wc -l"
12932

real    25m42.274s
user    22m40.965s
sys     2m54.831s