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Three 1TB drives yes its going to take a day or two but it needs to be done.
If you click on the RAID type icon linking the drives then Advanced you can Enable “Write-back cache” to knock some hours off but its still going to take some time.
So by now you should be at 30%~ if you left your system on.
In total it took 35 hours without write back cache.
Just for anyone interested, I tested the raid array (32kb stripe) after the initialization using ATTO disk benchmark 2.34 in windows 7 x64 (64kb NTFS cluster)
With write back cache ON: write speed was consistently around 70MB/s and read was between 150 - 210MB/s
Turn write back cache OFF: Write speed peaked at 90MB/s for 64KB files, and lowered to 30MB/s for 8MB files (and only 900KB/s for 0.5 KB files) , while read speed was same as with write back cache ON (150-210).
So if you have a stable OS then turning write back cache ON seems to give a good overall speed boost.