Fellas, looking in the Packages files, some big packages have little descriptions, some little packages have big descriptions, but on the average, 11938 packages avg size 510963 avg description 7.70431 lines avg. bytes per description lines 66321.8
For instance, the prestigious emacs21 needs only one line, as everybody who is anybody is supposed to know what it is all about. Computed with cd /var/lib/apt/lists/&& ls -S|sed q|xargs awk '\ /^Size:/{size+=$2;packages++};/Description:/,/^$/{lines++};\ END{lines-=packages;print packages,"packages\navg size",\ size/packages"\navg description",\ lines/packages, "lines\navg. bytes per description lines",\ size/lines}'