That sounds like a lot of anesthesia time. Would that be general anesthesia? I can just tell you I had 3 surgeries in 2.5 yrs and the third anesthesia really weakened me as Ioly had 8 mo from prior surgeryand it took awhile to build any endurance after third op. Anesthesia would be another major question....thats around 6 hours of anesthesia and for bypass they try to limit it to 4 hrs. That sounds tough to me, let alone the surgical issues too.
Best wishes!