Billionaire Japanese tycoon and future space tourist Yusaku Maezawa's training to go the moon should not be too tricky, he joked Tuesday, adding that he planned to use free time from his six-hour work day to squeeze it in.

Billionaire Yusaku Maezawa, confirmed as SpaceX's first Moon tourist, is a former wannabe rock star now worth $3 billion with a penchant for pricey modern art as well as space travel.