[ExchangeList] Exchange offline defrag timeframe

Any idea how long and how much disk space I will need to offline defrag the following platform?
 
Server: Xeon 3.6Ghz, 4GB RAM, RAID 5 on 4 15K RPM SAS drives
Exchange Server 2003 SP2
Primary Storage Group = 90GB
Secondary Storage Group = 15GB
 
Thanks.
 
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