How many managers of the same type can be used at the same time in a WinCC OA project?

The Data- and Event-Manager can have 255 connections to WinCC OA managers of the same type (UI, CTRL, Driver, ....) at the same time.
E.g. technically it is possible to run 255 UI managers at the same time for one WinCC OA project. At the same time the Data-/Event-Manager can have also a connection to WinCC OA managers of other types.