Question on Raid 5 array initial creation times

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I wanted to check to see if anyone could provide a rough estimate of
how long a RAID 5 initial build should take under mdadm.

I am creating a RAID 5 array with 5x1TB Western Digital Black 7200RPM
SATA drives on the following system:

Ubuntu 8.10 / ext3 filesystem on array and OS drive
1 gig of PC3200 RAM
AMD Athlon 64 3200+
Nforce4 motherboard

I am getting a minimum speed of approximately 14000K/sec with an
estimated finish time of roughly 19 hrs from now.

Is this a reasonable speed for creating a RAID 5 array with mdadm?

Thanks.
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