RG0592

If you have to catch a show, mention it to them right off the bat.  They are usually pretty good about rushing it.  We usually leave 2 hrs for dinner but when we have had to catch a show, we can usually get out before that.  I might be wrong, but I think Solarium Bistro is a sit down dinner at night so it may not be any faster.  Windjammer will be as quick as you want to make it.

Very well said, our dining times have been between an hour to two hours, with the average time around 90 minutes.  It's more about a relaxing dinner and good conversations learning about your tablemates.  We've always found something to chose from the menu and have been satisfied with our choices if not entirely pleased.

This varies.  On Mariner, we sat with 2 other couples/families.  Dinner lasted from 6-8pm, but the waiter was taking him time as he was letting us chat among each other.
We just got off Symphony and sat just the four of us (we have 2 kids).  The meal was a perfect pace.  Dinner was 5:30pm and we were out by 7pm, or even a bit before. One night they had the ice show at 7pm and was worried we'd miss it. We just let our waiters know and we made it no issue.
These are both traditional dining but would be similar for My Time.  Just let them know that you want to make a show.
PS - We really enjoy the MDR and it was especially good on Symphony.

The MDR is meant to be an upscale dining experience. My wife and I enjoy having a conversation with those we are dining. We like that each course is not dumped on the table within seconds of each other. Eating in the MDR is not a speed eating event. It is meant to be as much a social experience as a dining experience. We have met many other people from around the world when seated together in the dining room. It's a wonderful opportunity to learn about other parts of the country and the world.
If you are concerned about being late for an entertainment event then take into account how long that dining in the MDR will be and schedule your plans accordingly.

We had 4 adults and 1 child. 90 min minimum each night. Often closer to 2 hours. I thought it was nuts! 

Yes, you can order as much as you like. If you have a drink package, then as long as the wine is less than the drink package threshold ($12 or $13, depending on the ship) per glass then there is no additional charge. Else, you pay the difference.  If you do not have a drink package, then you pay for what you order.
There is a menu, but they have a full bar so you can order whatever.
I assume you mean with the drink package. Your only limit, per se, is with which wines per glass come in under the drink package allowance.
Yes, same answer as for the MDR.
For Oasis and Quantum Class, it's $13. The rest of the fleet is $12.

You would be charged the $2 overage plus the gratuity on the overage.