It can take a really long time for them to reply, especially as there is no withdraw option in the system itself (you have to request to withdraw it).
This happened to me, only I had submitted revisions, and then a mentor who finally contacted me after like 3 weeks offered to review my revision before resubmitting. So I had to resubmit the new draft, but the admin person was really good about it and let me just email it to him.