A: Most MRI's are read within 24 hours and the results sent to your doctor. He should have seen the results probably 48 hours after your scan. You are getting the run around, either that or they can't find the printed MRI report that was sent to your doctor and that is why you are getting the run around.ow long will depend on why you are having the scan and where you have it done. Ask at the time/place the MRI is performed. [ Source: http://www.chacha.com/question/how-long-does-it-take-for-mri-results-to-come-back ]. More Answers to  How long does it take for MRI results to come back .