Hi
@Rads Slaughter and May has never had a reputation for caring a lot about how early an application was submitted. If anything, the firm is know to look for a particular type of academics-focused applicants and to often depart from common recruitment practices when targeting them. As such, if the firm sees you as having a desirable candidate profile with a strong written application, I doubt they would not seriously consider your application you simply because you have not submitted your application earlier. As for your second question about the firm's recruitment timeline, in my experience they normally start making AC invitations around late December and host ACs in late January-early February.