Within 2 weeks with the exception of non-US properties. I find that it is non-US properties that fail to post on occassion. Call MR at 800-445-4442 or 801-468-4000 and let them know that it has been 2 weeks and they will instruct you to FAX them a copy of your folio and will credit the points within a few days.

Also, are you sure they had your MR number in your reservation? If they did it will be printed on your folio. If it is not printed on your folio, then you will want to write it on your folio before FAXing it to the MR office. I find it beneficial to keep my folios until the points have posted.