If the Hard Mode instance is allowed to reset (30 minutes with no one inside the instance), Blizzard has clarified that you will need to start from the beginning. Hard Mode Tazavesh with no wipes generally takes about 60-90 minutes, so make sure that you allot enough time!
Hard Mode Tazavesh Guide
Hello. Yes. That is how it’s intended to work. Tazavesh Hard Mode must be completed in one full run.
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