Hi:
My husband had open surgery in August of 2014. We chose the surgeon, not the methodology. His surgeon happens to do open.
He was in the hopsital for less than 36 hours. His surgery was at 8:00 a.m. on a Tuesday and he went home at 11:30 a.m. on Wednesday. He had no blood loss and they do recirculate the blood if there is blood loss. He was in the OR for approximately 1 3/4 hours. By the evening of the day of surgery he was already doing his second set of floor walk arounds. By 2 weeks post op, he was taking 4 mile walks around the neighborhood and we don't live in a flat area. He was eating normally the evening of surgery. My husband turned 62 shortly before his surgery.
Having said that, he did have incision discomfort on and off for several weeks and it took him awhile to fully get his energy back. He would run out of steam late in the afternoon and need a power nap. He was released to full activity related to running, lifting weights, etc. in 4-6 weeks (I don't remember if it was 4 weeks or 6 weeks). Whatever, he wasn't ready to lift weights at whatever point it was, although he did start doing some 2-3 mile runs. It took him about 3 weeks to start going into the office part time and about a month until he went back full time. I don't know if that was related to the type of surgery or how he heals. Everyone heals at their own pace. He was a little slower going back to work after back surgery as well.
Robotic is way more common at this point that open, but a high end open surgeon's patient experience is basically the same as to length of stay, etc. as a robotic.
Encourage you to pick the best surgeon you can find - don't worry about their methodology.