Hi Gary47,
I found that the actual surgery itself was MUCH better than what I expected. I hope your experience was similar. As for long term info, all the information I've read says that the dacron tube is a permanent fix. Of course, the better shape you keep yourself in, the better chance you give yourself. As for exercise, be sure to check with your doctor as some people will have limitations as far as intensity and strenuousness, but for the most part, after you're fully healed, you should be able to do anything that you could do before surgery. I found that working out was a very pleasant relief after surgery and many weeks of waiting to get the green light from my doctors. I felt fine long before they would let me get back to anything more than walking. So once they let me get back to real exercise, it was a real pleasure.
Just relax, try to enjoy your time off, and before you know it, you'll be back to your old self.
Congratulations again on your successful surgery. I look forward to hearing more about your recovery.
-Freddie24