I was circumcised as an adult, about 5 years ago. Your cock (except the head) is bandaged for 3-4 weeks, and you're pretty tender down there for 6-8 weeks. Any kind of sex is out for at least a month, at which point you pull out the remaining stitches (the doctor usually uses a self-dissolving suture material). The result doesn't look very nice at first - at takes several months of healing to really smooth out and start looking nice. Appearance continues to improve for 12-18 months, at which point I pretty much looked liked I'd been cut my whole life.
The pain really isn't a big deal. I only took a single pain pill on the first night, and that was just to help me sleep. It throbs a bit for the first few days, like a cut finger would - after that, you're just tender, and you don't want any pressure against your cock, or to hit it against anything by mistake. I had the surgery on a Monday, flew out that afternoon, and spent the rest of the week on a business trip, if that tells you anything. Unless you do heavy physical work, you'll need little if any time off.