I had a similar sized aortic aneurysm and underwent a 'modified Yacoub' procedure the end of Feb. It was a big deal (I an 65) for me and I had a host of post-op complications including AFIB, but when my heart was beating normally, I felt decent... At 2 weeks post op, I was walking 10k steps/day, at 4 weeks it was 15k steps but expect to be very tired after any exertion. I am at 14 weeks post op and am out doing pretty much everything I did pre-op including weights, hiking and biking. Be patient, dude... you don't want to be that guy that strained his incision too soon and has to go back to get your chest repaired as that will reset your recovery back to t=0... Good luck!