How much time does it usually take to recover after diverticulitis surgery?

4-6 weeks. Depending on whether the surgery is laparoscopic or open changes the recovery. Typically my patients are home after 4-5 days and back doing usual activity 3 weeks later. If the surgery was open - requiring an old fashioned incision - the stay is 5-7 days and it is 4-6 weeks of recovery.
Can vary. To some extent on whether the procedure was done laparoscopically or open laparotomy, whether there were any complications and co morbid conditions the patient may have. Generally 6 weeks should be adequate to resume full unrestricted activity.