Time to be back on board?

Hi everyone. I have picked up lots of tips on this site but still have one query. If we are due to leave port at 6.00pm what is the latest time we should be boarding ready for sail away? I am looking to book a snorkelling trip in Barbados and want to make sure I don't miss the boat, Thankyou.

Are you on a b2b or stay and cruise? If a b2b then sailing is about 8pm well after dark, but if a stay and cruise you will need to be on for muster drill

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You will need to be back on board by 5:30 for 6pm sailing

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You need to be back on board at least 1/2 hour before departure time

Thankyou both.