At least 7-10 days of no jumping at all, no running, no chasing toys, etc. I know it's miserable, but I assume it was an intestinal resection and anastomosis which is pretty invasive.
I'd just keep him in a small around where jumping (even minor) isn't a concern. Xpen or something...
I'm sorry about spending all that extra money on the drugs.
That was a big chunk and I wouldn't be happy either!