How much time does it take to recover from a corneal ulcer (ulcerative keratitis)?

Varies. based on the microbe causing the ulcer, the size, the location and depth of involvement. The range is days to several months. Also, recovery of what aspect? Treating the ulcer can be considered recovery, but if left over scar is in the center of your the cornea, the vision doesn't necessarily recover. Too many variables, best to discuss with your ophthalmologist. .