When it comes to finding the duplex and numbers working out, that one I can not answer. 

If you have a good relationship then they would be willing to answer questions but if you are just going to ask a bunch of questions they won't continue to answer.

There is a lot of variability in this answer and, like all things in real estate, it simply depends. 

To answer your question, if the home is priced at market rent, we are seeing our rentals lease out in 25 days.

@Cody Caswell there's several things to ask about here that might not be answerable in a forum:- Why do you need an FHA loan?

I have some questions that you may have the answers for. 

Answer sure.. have to check if there is a due on sale clause or if you have a PG to the orignal seller.. that mortgage stays in your name unless there is a formal assumption  Maybe the example is more challenging for a house as the property.Ex. with vacant land - seller finances to me $20k with 5% down and $1k/moCan I after 1-2 months, then resell the land to a cash buyer for $25k, pay off the original $20k and pocket the $5k?

None of that really answered my question.

If you have any questions about this or any other markets I would be happy to answer any of those questions!

If the answer is yes, then it's a no brainer to make minimum payments on your 2.8% interest rate mortgage, and use the funds that you would have paid extra to pay it down faster, to either invest in more real estate, the market, or anywhere else where you can get a ROI > 2.8%.If the answer is no, then feel free to aggressively pay it down as fast as possible, to become debt-free faster, and just have a large amount of money in savings or to splurge with.The bottom line is that your 2.8% mortgage is GOOD debt.