Also, how to prove "Spend more than 100 hours on the activity and no one other individual spends more time than you do"? 

I've been studying real estate investing the last few years and am considering jumping in.

Your only recourse on the PM would be if you could prove they did something grossly negligent, like leaving the doors open. 

FYI, after I was turned down by a local sub to mentor to be my coach, I dusted off and have been studying Carleton Sheets, No Money Down real estate program, that a family member gave me over a decade ago.

Independent studies (1, 2) and basic logic show you will make more selling it yourself.

There are a lot of studies on this but it is not the immediate response from professionals whose business it is to document all the ifs and and buts of a partnership and to  problem solve for the inevitable problems.

And half of American renter households spend at least 30% of their income on housing, which is up sharply since 2000, according to Harvard University’s Joint Center for Housing Studies.

Can they prove how long it takes to rent a vacant property?

What should I study in detail?

I’ve never closed a deal but I'm just gonna jump head first into it but I have been studying and reading lots and taking in content, I’ve done my due diligence.