One Piece Chapter 1, page 16: Romance Dawn

Luffy and Shanks happily munch on their food at the bar. Luffy asks: "Shanks... How much longer will you stay at this village?" Shanks replies: "Hmm... Let's see... We've been using this village as our base for about a year......we'll leave here for good and head north. After two or three more voyages." Luffy looks thoughtful: "I see... Two or three more trips, eh? Hmm..." Makino watches them with a gentle smile. Luffy then declares: "I'm gonna learn how to swim by the time you leave!" Shanks dismisses him casually: "That's good kid... Do whatever you want."