Current NICE standards say: 24 hours after you've had the baby, if you are not feverish, you can go home.
Although hospitals have these standards on the wall, that doesn't mean the staff have read them or agree with them.
That being said, I had a section at 6am Friday and was home Saturday afternoon. Because hospital days start at noon (!!), Saturday afternoon was counted as the third day after my section, which probably helped. I would have signed myself out against medical advice anyway, I was all ready to. (It's what I did after my first section!)