I saw him do 3... maybe 4? tables? But mostly 2 or 3 decks plus a 909.

Around here in Toronto area we had a local (Jeff Milligan / "Algorithm") who was famous for absolutely precise beatmatching, and often 4 deck mixing. Very minimal wonky/bleepy techno.

https://www.facebook.com/watch/?v=2083209238436343

https://www.youtube.com/watch?v=xAthnDk7ZcA

https://www.youtube.com/watch?v=b6EJOzGj4xM

Playing that minimal techno, I'd need at least that many tables just to keep from being bored.