Yow. That sounds unusual. All that cutting & stitching, so long in surgery - back in the day he’d be in hospital for at least seven days - and probably for the course of the ABs. And perforated — suppose it depends exactly what that meant for his appendix, but I think the ABs would probably have been delivered via IV for 48 hours.
deepop would know.
And your son is home in under 12 hours. Hope he follows his doctor’s orders and that there’s some good community nurse or similar back-up. Speedy recovery!