Always a pleasure to meet Mr Cabbidu and learn from the master!
Yes there are 5 Tests for the 500 hour Montblanc Laboratory test and all models of the Heritage Chronometrie collection will go thru these tests. One of them is indeed the 80 hour continuous accuracy control.
I am not sure if a timing cert will be issued or not. I have seen an example of the 500 hour cert for a Nicolas Rieussec watch and I don't recall seeing a timing cert. I also don't remember my Montblanc Villeret coming with a timing cert (unless it is hidden in the lithograph and I didn't read into the details)
Will check with Montblanc and revert Dean
Cheers
Robin