EarthMyHome ForumsThailandPhuketJudging by the ferry schedule, the latter sails from Phi Phi to Phuket at 15:30. It's very early. Can I still swim away in the evening?
So swim for 2 hours, consider by sunset you will be. No one will walk in the dark. (The speedboat goes 1 hour, for sure, there is a flight a little later)