Yes, they do. However, we recommend asking your recommenders and providing them with the necessary information about yourself early enough (at least a month in advance) so that they can submit your recommendation letters before the deadline. Although, if they do not get in before the deadline, colleges will not fault you for this - they know it was out of your control. Just make sure to submit your portion of the application by the deadline. If the college wants to know why a recommendation letter is late, they will likely contact your recommender directly.