I'll try to answer a couple of your questions since I work as an NLO at an Exelon plant.
They have tried to standardize the training pipeline across our entire fleet so the information should be accurate but maybe not precise.
1) The NLO class will consist of 6 months (or so) of classroom training where you will cover GFES (general fundamentals, think heat transfer, thermo, basic physics, reactor and operational physics, etc) and then you will take a GFES final BASED on an old NRC GFES exam, so if you study the old NRC exams, you should do all right... however there is always that one question that makes you wonder. This will not be an actual NRC exam that counts towards any sort of license, just one based on old NRC exams. They will use this exam as a benchmark to determine whether or not you will be able to pass the actual NRC GFES exam when you go for your license.
During GFES you will have a lot of extra time to study and you should have no problem based on you Navy Nuke experience, I studied 1-3 hrs a day plus a little extra on the weekends.
2) After GFES, you will move into systems, this was a little harder for me (I was an EM). You won't be required to draw any systems, however, knowing how to draw a one line diagram of the system helps immensely! I studied the most during this period of time, typically 2-4 hrs a night plus around 8 hrs on the weekend. Anytime you study on your own, Exelon will not pay OT for, so it all depends on how motivated you are. Systems training was kind of a "shock" to me because I was used to the fairly simple Navy systems. In the commercial world, there are a whole bunch more systems and sometimes you spend as much time on the floor drain system as you do on the ECCS systems... this is where the quality of the instructor comes into play, the better the instructor, the more you will get out of it. You may get an Oral board during this time.
3) After Systems training, you will have (depending on the site) Radwaste Operations Center (ROC) training where they teach you the ins and outs of the ROC. Pay attention, because this will most likely be the last qual that you get and you won't recieve any more training on it.
4) After all this they move you on shift to perform the OJT/TPE portion of the quals. Exelon does position based quals vice watchstation quals, so you will qualify all of your watchstations before you are qualified to stand any of them. This portion consists of signatures for various evolutions which require 2 sigs. The first sig is for OJT, whoever you are U/I with walks you through the evolution asking questions, etc.. similar to the Navy. The sig is for TPE (Training Performance Evaluation) where they just observe you doing the evolution with zero input, if you mess up, you don't get the sig. Different ways of messing up include not having the proper PPE, not utilizing proper Human performance techniques (i.e. STAR or Stop, Think, Act Review, similar to FOUTAP in the Navy, flagging, peer check, etc.) not placekeeping in the procedure, skipping a step, proceeding in the face of uncertainty, etc. Once all your sigs are done, you do area walkthroughs with a SRO. Then you are qualified.
Exelon has moved to the idea of hiring NLO's who they want to be SRO's because they have found that NLO's who work their way up through the ranks tend to be better SRO's and leaders, so go in with the attitude of learning. It is very easy to think that because of your Navy experience, you immediately know it all, don't fall into that trap, true, you have experience, but not the knowledge. I have been qualified for almost a year now and still annoy and bother my fellow operators with questions. The easiest trap to fall into is being to cocky and messing something up.
The whole process actually tends to be shorter then non-exelon plants. It took me about 14 months from start to finish to be fully qualified with an outage stuck in there for good measure.
I hope this helps.
Bill