The journey takes less than two hours: As the pier is close and the price is cheap, the Round-trip trip journey takes less than two hours. If you stay in a hotel near the airport or in the north, you can get a ride to Patong on the return(there is a luggage fee of 200 baht/piece).
Sleep 1 more hour: If the journey time is delayed by one hour, you can sleep one more hour. This is operated by the Phuket boat boss.
Sleep 1 more hour: Enjoy the Deep Diving Option G