Here they make allowance for the university not being open/boards not sitting throughout the process, for example something may need to be in at the end of July when everyone has left for the summer, so submission is allowed in September when they get going again, so I can't imagine there are not similar provisions made for no one actually being available to read the corrections at this time of year. If you have submitted, and have proof of submission the ball is in their court. E-mail your supervisor, and the admin team at your uni, they will be able to tell you, someone may even be there between now and the new year, and if not, I should think they will be back in by January 4th.