I cannot stress to you how important it is to get your app out as soon as possible! It takes AADSAS 4-6 weeks just to calculate your GPA after they have recieved official transcripts (already you're looking at 5-7 weeks, providing the transcripts don't get lost the first time, like mine did). After the GPA has been checked, it takes them up to 2 weeks to mail the printout (I believe they send them out in 2 week batches, correct me if I wrong, I read this in a previous post). AADSAS will not hold up your application for LOR's, or DAT so there's no reason for you not to send it. I'm not trying to freak you out, I'm just saying it takes them a long time to process the application. You never know your LOR's might be ready before the application. From what I've been hearing the average turnaround recently has been about a month to review transcripts. Best of Luck!