You can break it up if you need to.  That's not a big deal, just make sure you get it all in. I have many clients who work full time or work 18 hours a day, or 24hr shifts and they break up their workouts too. You have to find a way to make it work with your schedule.

The biggest thing to remember is that you are not working under the same circumstances that you will when you get to selection. You don't have the pressure when you are out at the gym by yourself. If you are finishing the workouts then you are way ahead of your peers, I guarantee it. But this also means you can improve your speed on some of the events. This is where I cannot completely replicate the feeling of being at selection for you. Keep it up and finish the workouts and you will be just fine. If you can find a workout partner, healthy competition will keep you on your toes as well.

No, I would recommend doing the Get Selected program for the reserves since you will have to go through their hiring process, which will include a lot of the exercises in the workout.

I think you could probably get by without doing the Pass the PAST program, it will be difficult for sure though. Just make sure you are ready to dedicate 2 hours everyday to training and you will do fine!