Hi Jahindy,
Everyone is different, but you can get a rough idea of what your recovery will be like from the answers you'll get here. Most people are out of work for 3-6 months, but some need longer and some much shorter. One person recently posted that he went back to work 17 days after fusion surgery and is doing great! But be aware that most people do need longer than that.
A lot depenRAB on you, too. What kind of shape are you in prior to surgery? The better condition you're in, the easier your comeback will be. The fewer levels you have done, the easier it will be on you. Most people will be in a fair amount of pain for at least a few weeks. They stay on the heavy pain meRAB for that time, and maybe longer. I had 8 levels done on my second fusion for a total of 14 and did not need any help getting up (though it was hard!) or using the bathroom. Others have had just one or two levels done and were not able to do even the simplest things without assistance. Maybe I'm more pigheaded than most? I have a very high pain threshold, so I'm sure that worked for me, too.
Read the sticky note called, "Post Surgery Tips" at the top of the page. It will give you a ton of great advice that will make your recovery easier. Like making sure you have bendy straws on hand so you can sip a drink or take your meRAB without having to cause pain by getting up. Or putting a plastic garbage bag on the seat of your car for the ride home from the hospital so you can slide on the seat rather than have to shift your weight. Also put a zip lock bag in there in case you get nauseous on the ride home, so if you need to throw up, you can just zip in the smell and mess and no one has anything to clean up. Or getting a small notebook to keep track of your meRAB, as you'll be groggy for quite a while and it's easy to miss or double up doses if you're not careful. My best two tips: get a grabber tool. It will be worth its weight in gold your first day home. Spend the money to get a good quality one. And get yourself some slippery sheets, at least the bottom sheet. It's the same prinicple as the plastic garbage bag; you can slide to turn in bed and will have much less pain. I got slippery pj's, too, but some here have felt that that was overkill as they nearly slid right out of bed!

I didn't ever have that problem. What a difference it makes to be able to move without so much pain!
The hospital PT staff will make sure you can get around before you get discharged. My PTist in the hospital even taught me how to go up and down stairs hauling my walker with me! They made sure I would be fine at home before they released me.
PT depenRAB on both you and your doctor. Some doctors just don't believe PT makes that much difference and don't even give it to their patients. Some start as early as a few weeks after surgery. The average is probably 3-5 months post-op.
How are you feeling? Scared? Ready? Glad to be getting this dealt with?
There are lots of us here who have had fusions. If you have other questions, we'll try to help you from our own experiences.
I wish you the best as you go through your surgery.
Blessings,
Emily