Depends on factors such as how soon you respond to NVC's requests, when a visa is available, etc.
J Charles Ferrari
Eng & Nishimura
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The scheduling is not done solely by the NVC. It also depends on the availability of calendar "slots" available at the US Consulate at which the case is pending. I would say that a minimum of 1-2 months may pass before you receive notification.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. A consultation with an experienced attorney is always the best way to go.