rafamiga:

... awk '{print $7 " " $11}' | sed 's!^([0-9]*) /([^/]*)/([^/]*)/([^/]*)/.*$!1 3@2!' | awk '{suma[$2] += $1} END {for (i in suma) {print i,suma[i]}}'
2010/11/30 15:20:57, 0