Im still at the point where I am trying to accumulate as much debt as I can, but in a few years I believe I will have enough debt and will shift strategy.

My interest is mainly in accumulating rentals for cash flow. 

It's good to have reserves, it's better to not have surprises ;) as for an exact dollar amount you can accumulate less per property as you acquire more.

Building wealth with any asset is the accumulation of capital which can then be deployed into assets to repeat the process.  

(A) need to accumulate more capital/equity somehow or(B) need to lower your monthly nut or(C) take on more risk to achieve higher returnsThe actual numbers vary widely based on market, types of leverage used, and how you operate... but the equation stays the same.

In the event you sell, all of the accumulated passive losses will get written off in order to lower your overall tax scenario.If you use the same tax preparer (or the better self prep software packages), those passive losses should get "saved" every year and then will be available to use when applicable.

I would tell past self that accumulating wisdom is excellent but experience is golden.

I have accumulated a multi unit (duplex), which I am currently living in one side and renting the other, and a single family that I rent out.

Most companies want a pitch so water does not accumulate.

After 10, I am going to take a break from accumulation mode and pay down some debt that I accumulated outside of the first mortgages and build up reserves.And see where I want to go in 6 months.Getting the 11th.