Converting RAID0 to RAID1 took more than 40 Hours

So I just debrick my MBLD with new harddrive (2x3TB), and after debrick complete the device running with RAID0 mode by default. But because i prefer using RAID1 mode so i change it on the web interface. And it’s been 2 days since i convert it and no progress (stuck in 12%), i can’t access SSH because it’s not enabled by default after factory resset. The drive is completely empty so it’s wierd the process take so long to complete. Anybody can help ?