Someone

#!/bin/sh

n=0

IFS=":$IFS"
for x in `manpath`; do
        for y in $x/man*/*; do
                echo "Checking `basename $y`"
                r=`zcat $y | nroff -man | wc -l | sed -e 's, ,,g'`
                if [ "$r" -gt "$n" ]; then
                        n=$r
                        name=$y
                fi
        done
done

echo $name - $n