Certify time = weeks

I just saw a lot of Certify questions, and I was looking to make my second big RAID5. The last time it was 5 4TB WD RE Enterprise drives, and it took forever and I never did more than 2 at a time. I did the second 2, limiting it to just 2 passes. So now, I load the 4 6TB Toshiba desktops into a 4 bay eSATA enclosure with port multiplication. After a few hours I looked at SR app and the least amount of time was 299 hours! One thing I picked up from the last time I waited and waited was that the numbers change very rapidly and will stabilize after 10-15 minutes after once yo are on the SR app page again, so that most of the drives will read about the same. These are all the same drives with the same software (no updates on Toshiba's site), but purchased at different times. The oldest one was from last year and had just over a hundred hours of use according to SR. After the second day, the numbers were around 174 hrs, and today just over a hundred hours. I think that when all four are running at the same time in that enclosure, it must have to share a single SATA port, and that's what may be slowing down an otherwise very fast connection. My first RAID5 was all done on 5 separate, internal SATA ports (cMP). I was really looking for a new faster way to do this. I would have been better off using those internal slots for doing the Certify, since my boot drive is on a PCIe card. Oh well, once the drives are RAID5ed, they will fine as that enclosure is totally backups. If I do the "copy newer" in SuperDuper, it will only take a couple minutes for each of four or five SR volumes. That's all it takes now with old 3TB Seagate drives as JBOD. I will have 18TB useable, so I will also have room for a complete TimeMachine volume on there as well. Always leery of RAIDs of any kind, I will also need to purchase an 8TB external that will backup all data from the internal RAID5 with TM. I handle boot drives separately and only have the minimum of data on them. I use SuperDuper "Smart Update" to make several clones of my current OS disk which I save to (extra internal Excelsior SSD), an external drive that is all clones from the recent past, and at least one USB3 flash drive. I am going to call it secure until it fails... PS Always use the fastest ports for Certify. One other suggestion is to unmount all your data drives as the only drives that need to be mounted are your boot drive and the device(s) holding the RAID disks to certify. I not only shut down both my screens, but even the USB hubs and audio. Essential is a powerful UPS that can mitigate any short outages so you don't have to start Certify all over again.