How long do untreated hemorrhoids hurt for after constipation?

Hemmorhoids. A thrombosed hem will usually hurt for a few days then gradually resolve, so the worst pain is likely a week or less then slowly better over another couple of weeks. It would hurt a lot less and resolve a lot quicker if you let a surgeon treat it very soon after the clot forms. Then get more fiber in your diet to prevent recurrence.
Depends. After constipation the pain you feel could be due to hemorrhoids but may also represent an anal fissure or tear. If the pain doesn't reolve with a few days of resuming regular bm's, see a colorectal doctor.