Hot Rod was out of it for about 3 days after his neuter. But he also had 14 teeth removed. After he rested up he was rearing to go and jumped on and off the couch before we could grab him. We had to really watch as he wanted to run around as though nothing happened once he felt better.
check out the link in my signature as I have an alternative to the plastic e-collars.
Feel free to pm with any questions.