The time it takes for sacroiliac joint pain to go away depends on how severe the joint pain is.
If the sacroiliac joint pain is acute then it usually heals within 3 days to a week but if the sacroiliac joint pain is more severe then it may take up to three months for the sacroiliac joint pain to heal and go away.
If it lasts longer than a few weeks then seeing a doctor about it is a good idea because they may be able to fix the sacroiliac joint pain sooner or prescribe you some medicine to help with the joint pain.