You are “supposed” to do the muster drill first before you take off for lido for lunch, etc. There’s no assigned time. Just go to your station, watch a short demo of how to use your life jacket, have your sail and sign card scanned (or boarding pass if you haven’t gotten your card yet) and that’s pretty much it. So much easier! It’s recommended to watch the safety video on your cabin tv as well. Keep in mind, if everyone doesn’t do muster, the ship won’t sail until all done, or if you try to buy a drink after a certain time, you can’t until you’ve done muster. Works very well.