How long would you all say "on average" I can factor to find a good tenant? 

By then the problem had been solved for weeks It is the SHOCK factor to the offending company which get the movement 

Other annual ROI calculations may include such factors as principal reduction, appreciation, as well as tax savings.

You can ask for your broker to factor in debt you don't have yet and tell you what the impact will be.

Insurance is a cost you factor in over long term.

If you have a significant loan amount that you're increasing the interest rate on, that's an important factor to consider.

If you're not factoring the value of your time, then hiring an expert for one house-hack may not "pay for itself" in terms of strictly dollars.

House hacking will be the best way towards your goals, as if you factor in the rent savings it is hands down the best ROI you'll see.

That made the idea of a charge to the contractor for delay difficult to justify, and the contract is silent about factors outside of the contractor's control or issues like approvals, which are naturally the owner's responsibility.

The two main criteria that I look at are ensuring that my PITI is covered or close to covered while living in the property and making sure the property cashflows when I move out when factoring in Capex.