Best of luck Ross!!!
I've had 3, 2 fusions and a lami, so I can feel for you. Realistic time to total recovery is 4-6 months on a fusion and a little less for a lami. However if you are experiencing a lot of pain that will be better when you wake up post op!
PT will help and you should be in pretty good shape 5 months out. Just don't push yourself too hard on recovery and slip backwards. Nerves heal from the injury to the end at a relatively constant rate, so from your back to your toes it will slowly progress. I found that remembering how much pain I was in pre-op made recovery a lot easier.