It actually can be quick, but no matter how agreeable, you'll need time to recover.
When I divorced (2000), I left a joint petition with a settlement on the counter.
She signed+filed. I put all I wanted in the back of a pick-up and moved out.
We were given a court date four weeks hence. We had -0- assets to divide.
Afterwards, I went to my Aunt's house in New York... to "get myself together."
I was a mess. BTW, this was 20 years ago, and we've both remarried.
I found that almost everybody has a divorce-story or knows someone who does.