A basic requirement under health insurance is that hospitalization must be for a minimum duration.
The usual minimum stipulated stay is 24 hours for the insured to make a valid claim.
However, certain day-care procedures like cataract surgery, dialysis, or chemotherapy may be exceptions where less than 24 hours is allowed.
But for normal medical or surgical hospitalizations, staying for at least 24 hours is mandatory.
So, the stipulated minimum duration in hospital is 24 hours.