thank you note timeframe

Not really... even if it is an afterthought, still a good gesture. Plus, gives you a way to plug in something nice about how you and the school are a good fit

 

No - I don't think it's too late. It's better to send one late I think, than to not send one at all.

 

I think you should send it if you are planning to. It doesn't hurt to do so.

 

you never know when the adcom meets so I would just send a thank you not regardless. I sent mine out a week later and the acceptance letter was dated one day after my interview.

 

I say go for it...I sent mine a little over a week later. Turns out Adcom met way before then, since I was in the last interview group before they met. BUT it is still courteous to send one. I don't think it will come off wrong. They interview many applicants, and just having them see that you sent one (regardless if they met yet) probably gets your name stuck with them just a little bit longer..which can help if they haven't met yet, and can help if you decide to attend, since you will be seeing a good amount of your interviewers as administrators, professors, etc..