I had my rectum and large intestine removed at the same time, so I'm not sure how long the surgery takes to only remove the rectum, but his surgeon will be able to tell him that. With any surgery, they recommend a convalescence time of up to six weeks or more, but everybody is different. I was out driving and grocery shopping only two weeks after my proctocolectomy.
I can, however, tell you about the wound care aspect of it. I had to pack the hole twice a day with saline-filled gauze, so it would heal slowly from the inside out and not get infected. I visited my surgeon every one to two weeks for her to examine it. Every couple of visits, she would cauterize the granulation tissue to help it heal better.
It did not hurt while it was healing, and I was able to return to work full-time and sit at my desk all day without any problems. It took 10 months before it completely healed up, but my surgeon said that it took a long time, because I was a slow healer. Keep us posted on when he decides to have the surgery.
Dx'd w/ Crohn's in '99 at age 28. Proctocolectomy and ileostomy in '06.
Pain-free, med-free, and very thankful to be healthy again :)