Whole thing lasts no more than 15-20 minutes. I took it easy for a few days but otherwise no issues. Was riding my bike and all that about five days after.
The only uncomfortable bit is when they put the anaesthetic... there's no easy way of saying this, but they have to stick the needle in both of the sperm ducts. That's a little uncomfortable but it lasts no more than 5 seconds per nut. From there on out no issues. You feel some stuff moving around down there, but no pain.
I had the scalpel free method, fwiw.
My clinic sent me this video to prep. It's quite useful. https://youtu.be/gzpYhe8QBsA
As opposed to other years when they were looking great