I'm not saying I disagree with you.

.," then put what you agreed upon and have them confirm it in a reply.If they disagree, I would try to work a deal with them to raise rents as much as possible and have them be responsible for utilities, OR figure out a way to get them out by crediting them (also known as cash for keys) 1 month's rent to have money in order to move, or give them back their security deposit + not making them pay 1 or 2 months rent.

I disagree; I think they're easier to make work.

I disagree with the comment made by Thomas S. 

I also disagree with breaking even in slow season.

If they disagree, fire them and find a new PM.

They are two completely different things.Lastly, if people tell you that you can do this without money- I would disagree with them.

In any event, I disagree with your statement about doing it yourself.

I disagree.

I disagree that there really isn't a "number", I believe most people that have 12-15 units and have a W2 job should likely have additional help in some fashion whether it's unskilled boots on the ground (friend, significant other), a PM company, or handyman you can call on.