I have to second the idea of using rebar to help hold the new floor in place. I'm sure, since you mentioned possibly having the pro's do it, I'm sure they'd do the same thing. A good "cook"/cure time should be around the 3 week mark, maybe a little longer.
***Please fill in your profile, at least your location. As this will help us help you better.***
"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown