"... another 2.5 hrs scheduled"? Are you separated/divorced, and is this some sort of agreed upon schedule of visitations? I don't know how one goes about increasing allotted hours in such a case, but if she is not letting you see him as much as you are supposed to, that is not right.

I am sorry you relationship with your son suffers. Perhaps some sort of mediation may help? Perhaps your wife can agree that whatever problem she has with you does not need to affect the child.