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我刚收到NVC acceptance， 现在到广州consulate安排面试要多久？我给妈妈申请绿卡，希望有时间订机票回国陪她一起去广州。

I cited the following at this link: 

Appointment (state.gov)

How long does it take to get an appointment?

Although NVC strives to schedule appointments within three months of NVC’s acceptance of all requested documentation, this timeframe is subject to the operating status and capacity of the consular section.  Currently, as a result of the COVID-19 pandemic, most consular posts are operating at a limited capacity as they work through a backlog of immigrant visa applications and scheduling may take significantly longer.