How many properties/units can you self manage before it becomes impossible?

[Patrick Crehan]

short background. I am about to start looking to buy a second rental property here hopefully in the next coming months. But also, I will be moving out of my house around the same time and turning that into a rental. In total, once I move out I will own 3 single-family rentals. I believe I can manage these myself but just curious, what was the breaking limit on properties for all those self-managers out there?