Under 10min? What is wrong with you? Who completes a Nightfall in under 10 minutes? It takes you about that much time just to reach the damn boss.
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10min with a full fireteam who knows what they are doing, that's not hard at all. Especially being 310+ with weapons like Black Spindle or Exotic Swords or even the Sleeper Stimulant. Either way, it isn't hard.