It's very hard for anyone to give you much information as it very much depends on the histology report - but it sounds as though you ended up having something very similar to the RARP procedure - that removes the prostate, seminal vesicules and the lymph nodes.
4.5 hours is typical of the RARP - mine was just under 5 hours.
So until the report comes back to determine what parts had cancer then it's pure guesswork. What I would say is that if, like me, the cancer had spread outside of the prostate, then RT remains an option.
Have you had a post-op PSA blood test yet?