I submitted my application on August 8th last year (it opened on Aug. 6th). My transcripts were received Aug. 14 and 21 (I had coursework at 2 institutions). My application was verified on September 3. I began receiving confirmations from the school that they got my application on September 8, and I got my first interview invitation on September 9th. I interviewed at 4 schools between October 9 and October 17, and I got my first acceptance on October 14. If you apply early, it is a pretty quick process.
The application was pretty easy to fill out. I don't remember it taking that long to complete. I suggest having a copy of your most recent transcript next to you as you are entering all of your coursework. That is the longest part of the application and having it in from of you really helps. If you are writing your personal statement in Word, i suggest copying it into a text document and then copy and paste that into the application. Sometimes the formatting in Word doesn't play nice with the online application and using a text document will remove that formatting.
As for the MCAT, I believe that you have to give the application service the ID number that you are given from the MCAT, and then you request that your MCAT scores be sent to AACPMAS through their online system that your scores are released to.
Hope that helps!