Hi, my incision scar is about 5 inches or so. I had multi-level laminectomies done from L3 thru L5 and he also snipped off any proturuding disc material ( I did not have any fusion, my surgeon is more conservative in that area) I think my parents said my surgery was about 2 1/2 hours. I was told the hospital stay is usually about 2 to 3 days, I stayed 2 1/2. That is as long as you are okay, your vitals are ok, and you go can go to the bathroom. You'd be surprised by how short a hospital stay it is for many surgical procedures. I think part of that is due to insurance companies...but I know with back surgeries, they want you up and around as soon as possible. They got me up and walking with a walker the day after surgery. Boy it was painful, but I didnt care b/c it was a different pain and I was able to stand up straight again.
Your scar might be a little smaller if you're only having one level done, I dont know..but they still need room to get in there. I personally wouldnt have cared if my scar when up my whole back! LOL My condition was at the point I was soo bad and the pain was unbearable, i didnt care what kind of scar I had. Mine healed perfectly and I had desolvable staples inside with tape to close the wound on the outside. I think having the tape and no stitches on the outside also helped in how good my healed scar looked.
Good luck on your upcoming surgery and let us know if you have any other questions!