Putting 2cm granite on top of plywood and adhensive

There is no reason to glue down engineered hardwood floor to an underlayment. This is just for initial aesthetics. The glue will NEVER last (in a residential setting). The only thing the glue will do is give you fits and make your install seem tighter. Within weeks or months the glue will come loose and you will have a floating floor.

Nothing wrong with a floating floor. But the fact is you should be gluing the pieces together, not under them. The big boxes sell the generic engineered wood flooring glue. Buy that and glue your pieces together, not under them. The only time I have seen gluing to the floor to be an option is thin flooring onto concrete for commercial purposes. The only thing I would glue down in someone home is vinyl sheets/squares.

On its website it says 8-10 hours. However it is not for the application you used it for. It is for gluing wood to things. Not for gluing foam/felt/whatever to concrete. Your underlayment has basically formed a bubble underneath. The wood glue needs a lot of air to dry - hence wood glue there will usually be a lot of air available. Now that the outside have dried quicker of course, now the inside is in the trapped little bubble with no chance at getting good air. It will eventually dry but this depends on the material and how dense/thick the concrete is. Also you may want to just remove and use the right glue - which will probably last longer - but that is up to you. This could take 2-5 days to dry and since the glue was made for wood it may not bond right.