My first surgery lasted longer than the initial 2 hours because my doctor had students, and they were using my surgery as a lecture. I woke up in pain, not because of the surgery, but the anesthesia gave me a bad headache. Once that wore off, had very little pain.
Second surgery lasted 1.5 hours, as soon as the anesthesia wore off, they kicked me out of the hospital. Went in at 8AM and was home by 1:30PM. Had an earache that lasted a couple days, but very little pain on the incision.
Cochlear has made progress over the years to make surgery less invasive and faster.
The worst part of the whole process, for me, was the vertigo that I got the day of the surgeries. Since the doctor is poking a hole in your cochlea and draining the fluid, I was be off balance until the next day (again everyone takes different times to heal).
Warning: Anything I post may not make any sense. All advice is for entertainment value only. Sarcasm might be present. Interpret at your own risk.