As an example, our request for rent increase that was submitted in Sep 2023 has not been processed and may never be processed.

Also your permitting process, type or land, grade of land, if underpinning is required will all play a factor into your cost. 

Quote from @Jonathan Blanco: Is it worth seeking lenders with $0 lender fees (such as origination, processing and underwriting fees) or do they just get that money by increasing rates and charging higher points?

Not sure why the process would be any difference for a voucher holder in a duplex or single family.

Some states are easier than others; however, it is important to understand the process and laws of owning properties in another foreign state.

Working with a reputable team can ease the process.

Give sellers the space to make their decisions without rushing the process—trust takes time to build.Listen More, Talk Less: The best closers are the best listeners.

Nights, weekends, holidays, etc.To keep this on-topic, though...DO figure out what's healthy for you to manage but remember it's a process where every experience teaches you good and bad (and be patient with that process).DON'T sweat the small stuff (damage/costs under $50, undisclosed dogs, etc.) but DO find a way to learn, prevent, put in better practices to maintain your sanity. 

Whenever possible I attend the inspection and follow the inspector as he conducts the inspection and ask him questions during the process.

They were abandoned and needed significant work which wasn't a huge issue but in terms of HUD owned properties i heard there can be significant processing periods.