firewall structure support

["Paul Berard" <pberard () videotron ca>]

Good day,
Is anyone is aware if there is "reference" paper that give some idea about how many
people is needed to maintain and support a firewall structure (and maybe also VPN) , something like the number of 
personnel per service/client. As far as I am concern it should be on a case by case basis but management really love 
those "official" report and up to now I could not find anything other than, it is related to your network 
configuration, make sense but... 

Any pointer would be nice

Thanks

Paul