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how long should it take to create a raid 10 with 4 3TB disks?

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http://askubuntu.com – I am trying to create a raid 10 with four 3TB disks on ubuntu 12.10 with mdadm. I was wondering how long should it take to create the raid. Right now when I look at /proc/mdstat it is showing 19107 minutes. That is more than 13 days. Is this normal? Are there any tools that can achieve the same result faster? My boot drive is different from the disks in the enclosure. I am using mac mini 6,1 with ubuntu 12.10 and external USB 3.0 raid enclosure. I have Western Digital 3TB disks. Thank you for your help. Srikanth (HowTos)