how much time a RAID controller will take to rebuild the data

I have 2 x 40 GB IDE harddisks (H/W RAID 1 configuration) with 20 GB data on it, suppose one of the harddisk fails then how much time a RAID controller will take to rebuild the data on new harddrive ?

Following are the Server Specs

3.2 Ghz HT Processor
1 GB RAM
2 X 40 GB IDE harddisk
3ware escalade RAID Card

I would like to know in advance what will be server's approximate downtime if the above situation occurs.

 

 

 

 

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