That was the case for New Orleans, but they also had some stipulation that you could not start marketing your property during that time.  

Take a look at this video, it describes the stipulations quite well and definitely helped me out.https://www.youtube.com/watch?

You might want to stipulate that to your end buyer ahead of time so they can inform their lender...Kudos,Mary

If I were in your shoes, I would put in the contract that $10-$15k (depending on cost of property) stays in escrow until the house is vacant, with the stipulation that if they do not leave on time that money is used towards their eviction costs.

I am not aware of any such stipulation, but am not an expert.I do know that in the absence of a written agreement, and verbal or expired agreements are effectively month-to-month agreements. 

A secondary market loan will have stipulations and cash out refis on non-owner occupied properties are tought to get, most of the time I was doing loans, they were not allowing them at all, that may have changed, but I doubt it.Best to simply ask your lender and see what they want you to do.

any stipulation regarding time to resell ?

Only stipulation I have is then I would have to live in it for a while and some of the properties I’m looking at buying aren’t close enough to me to do that.

Let your policy make your decision.My policy says she potentially falls into the grey area where we consider multiple factors that might mitigate the "score", especially if additional stipulations are added for security.

This stipulation could have just been my mortgage provider being strict.