NAS Backup HDD smart extended test stuck at 10% , what should I do ?

I just got a brand new WD elements desktop 12TB external Hard Drive to back up my synology NAS , but before doing that I want to run a extended smart test on it to make sure it is good.

I downloaded WD Kitfox and run extended device self test (I know wd elements is not officially supported but it is detected in the software plus WD doesn't offer any other diagnostic tools for it) , and now it is stuck at 10% progress for an hour now , should I keep it running or abort the test ? Also is there any software that can do extended smart test ?