A lot. Unless you have face blindness, you can remember a lot of faces. Is this all in the brian? We do our best to explain the research behind our ability to recognize a very large number of faces. 

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Links and References: 

1. https://www.science.org/content/article/average-person-can-recognize-5000-faces
2. https://zuckermaninstitute.columbia.edu/computer-models-mimic-brain-s-ease-telling-faces-apart
3. https://www.theguardian.com/science/2018/oct/10/how-many-faces-average-person-recognises-5000

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