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The official RealSense SDK can currently actively use one camera at a time. The open-source Librealsense SDK that Intel supports can use multiple cameras, though Librealsense does not contain all the functions that the official SDK does.
I am not personally aware of a maximum camera limit in Librealsense. If this is the case then the limitation is likely the resources available on the machine.
In early 2015, an early RealSense-powered drone had six R200 cameras connected in a 360 degree arrangement to a single PC board on the drone.