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I'm looking to submit an Early Decision application today to Columbia (deadline 11/15), but one final professor has not sent in her letter of rec yet. That should be in this afternoon, however.

I'm assuming it has to be in by midnight EST tonight?

I know a lot of people have been complaining about the status checker not showing their Columbia app's complete despite having sent it in, is this anything to worry about as long as I submit it by midnight tonight?

If the letter hasn't reached LSAC yet they won't have it processed by midnight.

They require your application be complete by today so honestly I think you might be SOL but I would call them here in the next half hour before they close.

It'd be electronically submitted, not mailed, so it would be ready to send by midnight EST tonight.

I have 3 rec letters total, however - is it possible to send in the app now, then add the last one later? The Columbia app states that it can wait to register my app as complete until a third rec letter is in later, but I don't know if it has to be complete by today, or just submitted with all the requisite material.