Yes, the muster drill is required of all
passengers. If you are departing port at 4PM the drill will probably be between 2:30 and 3:30 PM.
will close down and you'll be asked to either carry or put on your life vests (they'll be in your cabin) and go to your muster station.
This is very important! Your cabin will be checked to make sure you are at your muster station. When you board you will find a Princess Patter's in your cabin that will tell you what time the muster drill will be held. If you miss the drill you'll be required to do the "make up" drill the next day.
Because I can't walk very fast, we usually leave the cabin about 10 minutes ahead of time and make our way up or down the stairs (the elevators will also be turned off, just as they would be if there were
an emergency) to our station so that we'll know where to go in the (unlikely, but possible) event of an emergency.
It usually only takes about 15 minutes, and then you can continue to have fun
. Before the drill you can eat, drink, or do anything else you want
I personally find the muster drill very comforting! I know what to do "just in case"!