As of last writing I had lost the lower retainer and was waiting for a replacement (expensive). The doctor also wanted to modify the upper retainer. So I will pick up from the point I received the new appliances not long after my previous post.
You will notice that the upper plate area is now gone, leaving an open space. This has created a major improvement in how I speak when the appliance is in. On the other hand, I only wear it to bed, so speaking is not much of an issue now. The appliance is comfortable and I wear it every night.
Observant readers may be realizing that progress with the lower jaw and teeth appears to be slower than the progress that was made with the uppers. Indeed this is so. To understand why, one must realize that the bone of the lower jaw (mandible) is much more dense than the upper jaw (maxilla) which is kind of porous. This means that much more "stuff" must be laid down in the process of creating new bone there. So that takes the body longer to accomplish. It's that simple.
I am wearing my lower appliance 16 hours/day, taking it out to eat. There is little effect on my speech. My habit is to take it out before breakfast (OK, coffee) and then after lunch put it in for the rest of the day, excluding dinner.
While I was originally hoping to be finished with this whole process in about a year, it is obvious now that is not going to happen. We are already over a year in and have months to go. But it was very satisfying to have the uppers straight as quickly as that occurred. It gave a real psychological boost.
No improvement so far on my (ordinary) snoring.