I did have a surgery during a horrible flare. I had strange cells in my urine, and they put me to sleep in the hospital and the urologist and the guy that puts you to sleep knew I was sick. I was very sick with the uc at that time. They were ok with it, and just went in my bladder, ureters, and kidneys and looked around and took a bunch of biopsies. It didn't take a long time, but maybe a hernia operation would be a short one unless the hernia was really big. I ended up having an ileostomy a year later, but it is so much better this way. I got rid of those horrible meds and got my life back.