2 weeks: Assuming uncomplicated surgery, most surgeons would advise that you avoid submerging your head in water for about 2 weeks after the surgery. The full healing time can be around 6-8 weeks but 90% of it occurs within the first 7-10 days.. Get help from a doctor now ›. 20-35 minutes: Most cataract surgery in the absence of complications or pre-existing problems like trauma or congenital problems-most will take 20-35 minutes.