Comments of chapter undefined of Demon's Diary

assumption: fast... boat is 300km/h: 300*15(flying hours per day)*10days=45000km.... earth has a max distance of 20000km (from any!! place on earth to reach the Most Distant Point...) soo this Planet has to have at least a Diameter of 30000km!! our earth has 12745km... Gravity???? sooooo MATH is Not Magic!!