How long are you without your passport for US non-immigrant visa?

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I am an Indian Ph.D. student living in Europe at the moment, and one of my research papers has been accepted for a conference in the US.
The conference will be in February 2020, I need to apply for a non-immigrant visa (B1/B2) as soon as possible. However, I need to travel to my home country in December 2019 and I need my passport for that.
How long does the US embassy keep your passport?
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How long can you stay in the US without a passport?
The Visa Waiver Program (VWP) enables most citizens or nationals of participating countries* to travel to the United States for tourism or business for stays of 90 days or less without obtaining a visa.How long does a non immigrant visa take to process?
The entire visa application processing takes somewhere between two weeks and four months, depending on the type of visa. Please check what visa category you are going to need to have enough time left for the application process. Additional factors.Can I process visa without passport?
In order to apply for a travel visa, applicants must have a valid passport as the visa is typically stamped or glued into the passport. In the case of eVisas, the visa is linked to your passport number in the country's travel database.Can I travel to US on non immigrant visa?
Visitor visas are nonimmigrant visas for persons who want to enter the United States temporarily for business (visa category B-1), for tourism (visa category B-2), or for a combination of both purposes (B-1/B-2).HOW TO CHECK STATUS OF YOUR US VISA AND TRACK YOUR PASSPORT.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ken Cheung, Nataliya Vaitkevich, Eric Thurber, Porapak Apichodilok