Notwithstanding the above very valid comments, my answer to the question:Less than one year - unlikely to happen, given that they will have rejected you shortly before thatOne year to four years - possible, but would they bring you in at the level you would be moving into at your prior firm, or will you be taking a lateral/backward move, in effect losing at least a year?Post-MBA, the only one that makes any sense to me, assuming you are mad enough to want to continue in the industry