I tell most of my students I would manager myself at least 3-6 months depending on the learning curve.

If you did a cost segregation study on the property in the past, you may have to recapture the depreciation taken in the past.capital gain tax rates are 0, 15 or 20%There is also a potential 3.8% Net Investment Income Tax.Also, don't forget state income taxes depending on what state the property is located or your state of residency.Best of luck!

In any case, I thing your investment are pretty solid and should earn you something between a decent return all the way to a spectacular return depending on the local economic situation.  

@David Sohn It depends on what your purchase price is.

When I pay the mortgage the normal way (and remember, I did this for years, so I know that depending on other bills, I'd have $5-$6K in checking pretty consistently), I'm paying about $20K in interest and taking about 2 years to pay down the first chunk of $10K on the mortgage.

I think it depends on the individual and opportunity.

I know conventional lending could become an issue depending on the condition of the property.

Depending on the location and the city, these could take a long time.

Depending on your practice size and income level, you may just want to start with maxing out 401k and also adopting a defined benefit plan before committing to becoming a lifelong real estate investor.  

I believe it depends on the lenders funding source.