How many rounds are there in Vanguard Zombies?

How many rounds are there in Vanguard Zombies? After surviving 12 rounds in the Void, players earn a reward that prevents Perks from dropping below Tier II upon going down for the rest of the match.

After surviving 12 rounds in the Void, players earn a reward that prevents Perks from dropping below Tier II upon going down for the rest of the match.
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