an example from my computer running the dnetc-client.
it's an athlon/650

[Aug 01 18:13:49 UTC] The keyserver says: "Cow told me to change this proxy message so I did (ivo/1)"
[Aug 01 18:13:55 UTC] Retrieved 51 RC5 packets (321 work units) from server
[Aug 01 18:14:05 UTC] Sent 82 RC5 packets (652 work units) to server

16 sec ca. 22kb -> 1408 bytes/s

[Aug 02 17:20:58 UTC] The keyserver says: "Why is a cow2 ? Mu. (Ommmmmmmmmm)"
[Aug 02 17:21:16 UTC] Retrieved 116 RC5 packets (688 work units) from server
[Aug 02 17:21:31 UTC] Sent 90 RC5 packets (699 work units) to server

33 sec ca. 29kb -> 900 bytes/s

[Aug 03 18:23:08 UTC] The keyserver says: "Cow told me to change this proxy message so I did (ivo/1)"
[Aug 03 18:23:18 UTC] Retrieved 69 RC5 packets (534 work units) from server
[Aug 03 18:23:32 UTC] Sent 114 RC5 packets (676 work units) to server

24 sec ca. 26kb -> 1110 bytes/s

so let's do some math.

the client needs ~25 seconds per day for update.
in this time the client will transfer ~30kb.
now we have 500 computers.

NO, that's not 500*25 seconds, thats 500*30kb, period.

the bandwith is also 15000kb/25s = 600kb/s (for about 25 seconds per day)

and now it's going to be exciting.

$415,951.49 in bandwith charges, 59 cents per second.

$415,951.49 / 0.59 = 705002,5254237 seconds

that's 28200 days a 25 seconds

that's 77 years !!!

ps: How old is the Georgia Attorney General ???