You should plan to spend about 3 hours dining at Remy.
I do not know their hours of operation, but rest assured that enough time will be allowed to complete your courses.
The menu is a set 5 courses (and several amuse-bouche and sometimes a bonus dessert), and priced at $125 per person. If you do not like a course, they will of course remove it for you, but the price will not be adjusted.
Of course the menu is subject to change, but an EXAMPLE of what one might expect would look like this:
Amuse-bouche - Canapes
Bread Service - Breads served with several types of butter
Course 1 - Fish
Course 2 - Lobster
Course 3 - Beef
Course 4 - Cheese Plate
Course 5 - Dessert
Bonus Dessert
Keep in mind, when I say "Beef" i don't mean a 16oz Porterhouse Steak, it's more like a 2oz slice of Wagyu Filet. So while it seems like a lot of food (and you will be full) it's not 7 full-sized entrees.