1) Earth has about 6 gyres. There are the Indian Ocean gyre, North Pacific Ocean gyre, a central Pacific Ocean gyre, South Pacific Ocean gyre, North Atlantic Ocean gyre, South Atlantic Ocean gyre.
2) The North Central Pacific Ocean gyre is about 8400 miles across. The area of the gyre is about 11760000 miles ^2.
3) A marine piece debris can travel about 168 kilometers a week.
4) The bottle could of been in the water for just 18 hours at least.
5) The research vessel could travel it in about 39 days