How long is the recovery from corrective surgery for something like imperforate anus?

Variable: The recovery from any surgery wil factor in the complexity, co-existing defects, need for ICU care etc. The imperforate anus defect can be as simple as a thin membrane that separates normal colon from the perianal skin, to a high defect, where the colon must be mobilized & brought down. Abarrent fistulas may enter bladder, vagina or penis, staged repair with colostomy may be needed. All are unique.

Days to weeks: After definitive surgery, that is recreating the anus, the child will stay in the hospital for about 2 days. 2-3 months later as long as the any is healed and if your child has a colostomy it will be closed and your child will stay in the hospital 2-4 days.

Depends : Depends on what stage of treatment. Initial treatment is a colostomy. Second stage is repair. Third stage is closure of ostomy. Recover to bowel function is usually 2-3 days after each surgery.