How long should it take to 'Verifying RAID parity'?

I have a EX 4100 that has been verifying RAID parity for 18 hours now. How long should this take? I am using WD Red 4TB NAS Drives.

Hi @rfwilliams,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting: