Ian,
You should use the mailbox sizing guide from the document below.
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/8x/administration/guide/8xcucsag190.html
Your calculations depends on the recodring codec you have chosen..for G711a/u you get 11KB/s of recording..
You calculate it like this..
1s----------11KB
30min (1800s)------XKB
X=1800*11=1980KB
So for 30mins for each user you will need 19.8MB.
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