They're not fast, but usually only take about 3-4 seconds for me. I'm using a 4 disk RAID 0, but they're just ordinary 7200RPM disks, no SSDs or anything.
Can I just say ":o"? But I'm biased having been plagued by disc-related disasters in the past! I won't use anything with no data redundancy these days. Shame that didn't save me from a PSU failing yesterday, though.

Er anyway, /OT and all that.