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The 454 (which is really the 404 with different drivers) is the raid 5 one.
I'd guess a few hours; theoretically it can go at full disk speed, but they usually don't get quite there, so maybe 35 mb/s or so. For 250gb, that's 2 hours or so.
oh ok. I was thinking maybe the card was damaged or something. When i had it setup as a raid 5 it never rebuilt. But this mirror took about 2.5 hours. So it's good, just slow.