I am sorry and I hope he gets better soon. My grandmother has it but has not has surgery (she is 91).
3 people I have worked with have had the surgery. Two successful and very straight forward recovered in about 4-5 weeks on average and back to work. The other one (a closer friend of mine) a nightmare. Not to scare you but her experience was horrendous. The doctor knicked her colon and she went septic. She spent a month in an induced coma, respirator, on kidney dialysis & came out with-a colostomy bag, months in rehab. Was out of work for 7 months in 2009. Lived with the bag for several months before having the reconnect in 2010 which she was petrified to do. That was a month recovery (she pushed it to get back to work, but was ok). She is functional and working now, but her stomach is disfigured and digestive has never been quite the same since. She is since suing.