Hi, Every case is different, but I can tell you of our experience, my husband had his second attack in February, he was 48 at the time. According to the docs, this was another "slight" attack same as his first one. He had a stent implanted and went back to work in about 5-6 weeks. He never did rehab, though it was recommended, we skipped the rehab because he could not drive himself, and the nearest hospital for rehab was 45 minutes away. The fact that your friend is a non smoker is great. His doctor probably wants him to do the rehab before he sends him back to work, most doctors do. Good luck.