the conversion to dual redundancy takes a long long time, I think it took 3 or 4 days when I last tried it.
expansion should take about 8-12 hours as i recall.
since you have no data, your best bet is to insert all disks and factory default using the boot menu, select dual redundancy from RAIDAR and you should be done with resync ~12 hours or so, if I recall correctly.
nv+ ~ 1gb ram ~ 4x WDC WD20EARS-00S8B1 ~ 5555 GB ~ power supply dead
ultra4 ~ 4 gb ram ~
pro business ~ 4gb ram ~ 2x Seagate ST4000DX000-1C5160 ~ 2x Seagate ST4000DM000-1F2168 ~ 10tb
pro 6 ~ 4gb ram ~ dual redundancy ~ 4x Hitachi HDS724040ALE640 ~ 2x Seagate ST4000DM000-1F2168 ~ 14tb
A/V streaming ---> Subsonic
---> HTC One ~ Note 2 ~ Nexus 7