On what basis do you highly doubt approval would take that long? Best case scenario acceptance of the NDA is 3 weeks out, worst case it is 2 months. Even with expedited review, it's going to get approved in under 5 months? Why would that be?
Do your homework. Ive done mine and think approval is not as far as some make it out to be for whatever reason. Just my opinion though. You think 6-9 months away..... thats your opinion.... no problem with that. Good luck to you.