Well, I think there is alot of factors, how long you had the tumor and what it's stuck to. and how hard it is to get to based on what proceedure you have. How determined you team are to get it all, IMO after 12 or so hours if it's a large tumor that's been there a long time some doctors give up and leave some of the sac. IMO the biggest factor is what it is pushing one and stuck to. Most of the 12 crainal nerves are real close where the AN is located and if it stuck to alot of the nerves then it takes a few days for some to recover and some may never recover like the facial nerve.
In my case I had a tumor on the larger scale and it had been there for maybe 20 years, took my team about 17 or so hours to get it all. When you out for that long and removal of the inner ear pieces may require longer recovery. I went in early 5:30 on Thursday and was released late the next Friday. 8 Days. I had severe head pain and was on morphine two to three days after. Most Hospitals don't know how to recover an AN patient so they may send you to stroke rehab.
after my operation My vision was sideways, too about 12 or so hours for my brain to adjust to one balancer before it came up to normal. Beings I was out for so long I didn't feel like eating for a couple of days and by Tuesday I was able to get out of bed. By Thursday I was walking on my own and they was satisfied late Friday and released me. I lost 29 lbs in the 8 days I was in the hospital.