@golf07 - Your dad is fortunate he had such good results from his surgery. My husband went through something very similar, but didn't have good results.
He will probably have a colostomy bag for the rest of his life. This has been very frustrating and life changing for him, as you can imagine.
When he had is low anterior colon resection, I can't remember for sure how many inches of his colon they took out, but it was a lot.
He is thankful that the cancer has not returned, but this is something that has dramatically affected his life. It seems like his life revolves around a lot of doctor visits and medical procedures.