As far as recovery time, a lot of that depends on how severe the appendicitis is when they do surgery. And I don't want to worry you, but I do want to caution you... Appendicitis is very often overlooked in CF kids. I took my 9 year old daughter into the ER twice in a two week period in August of this year. They did CT Scans and sent her home. I won't bore you with all the long details, but long story short, her appendix had been ruptured for over a week before they finally took me seriously and did surgery. Because it had gone so long the surgery was much more complicated and her recovery was very difficult. She was in agony for about 3 days after sugery and had to stay in the hospital on IV antibiotics for a week.
From what I understand now, because CF kids are typically so small and have hardly any body fat, the contrast that is used during the CT Scan doesn't spread as well thoughout their insides as it would in a person with more body fat. For that reason, they often overlook appendicitis in those kids. I have heard so many stories of that happening since Kacie's surgery.
If the doctor thinks he has appendicitis, what is he waiting for? I guess I don't understand that part... The only treatment is surgery (as far as I know anyway) and the sooner it is done, the easier it will be both during and after surgery. I would be very hesitant to wait and see how it develops.
Best of luck to you and Toby!!!