I thought late september-early october was nearing the late period. Pretty sure early to mid september is "on time"
He is referring to II. You're talking about getting your application into schools. I'd be really worried if not getting an II by late September was "late".
So all these “holiday rules” that
@LizzyM provided are just guidelines and not absolute rules. I think the deadlines set are too early but still serve as good references.
The Labor Day rule says you should complete all your application requirements (including sending letters and secondaries) before Labor Day to be considered on time. After Labor Day, you’re getting late because many schools, especially the super rolling ones, are sending out many interview invites. Others think early September is still early to be complete and the ideal date is somewhere in late September.
The Thanksgiving rule says if you don’t receive an interview invite by Thanksgiving, you should consider plans to reapply. It’s just a gentle reminder that tells us already what we know: you should still improve your application during the cycle and prepare for the worst (having to reapply) while hoping for the best (getting accepted).
For a borderline applicant who wants to get in for sure with a good list or for anyone who wants to play safe, this is what I think is an ideal timeline:
1. Submit AMCAS primary in early June so your primary will be verified and sent to schools late June
2. Get all the letters ready months in advance, and especially find out when the committee sends their letter
3. Regardless of 2, prewrite all secondaries ahead of time to prevent secondary fatigue and to submit everything back to schools and be complete in early to mid July.
Being complete in July is early. In August it’s on time. And in September after Labor Day is getting a bit late. Early completions get early interviews and early opportunities on getting final decisions (so early acceptances). This is a general idea from an application complete viewpoint.
The actual timing of interview invites varies greatly from school to school. I’d say getting an invite after January or so is getting late.