Ask any of the guys that have recently gone through the course, and they will tell you that your 6 weeks will go by really fast...
Translation: towards the middle of the program, after the ground school and before the sims start, is the toughest time during the 400 training...you really feel the pressure of the looming oral exam, and feel that you don't have enough hours in the day to get it all in your head.
But, of course, you do get it all in your head...and it works out fine in the end.
The recently-hired will tell you that there are plenty of CPT and SIM events for you to work out kinks...