Ours have always occured before leaving the dock; not during sailaway.
I thought the rule was within 24 hours of sailing to have the drill although the only time we had muster drill on second day was when we overnighted one time in Hong Kong and another time in Venice.
"The test of a first rate intelligence is the ability to hold two opposed ideas in the mind at the same time and still retain the ability to function."
F Scott Fitzgerald
Seven Seas Voyager (30nts) - Dubai - Cape Town - Nov 14