Property management not easy to do competently?

[Mike Franco]

With all the complaints about property managers and mgmt companies, you'd think it were a job that can't be easily done competently.

As a landlord myself, I know what it takes to manage my own properties, and barely spend any time on it. 

I was thinking about branching out and managing other properties.

Does anyone have any idea how many properties one person could manage before it gets overwhelming?