How long the pain last for uti?

Right abx - 1 day.: Pain from a uti, when the right antibiotic is used, will improve within a day. If it doesn't, don't suffer - call your doctor for a reassessment or a prescription for a different antibiotic.

Usually < 1 week: Antibiotics, if effective, often clear the bladder of bacteria very quickly because they're concentrated in the urine. However, the inflammation (irritation) of the bladder walls may take days to resolve and the symptoms like burning with urination, frequent voiding, and pain. If these persist beyond one week or high fever or flank pain develops then contact your doctor.