Swim Time Trail. Fail.

I wrote my goal times down on my arm in marker.  1:50, 3:40, 5:30, 7:20, 9:10, 11:00, 12:45, 14:30, 16:15, 18:00. I kept the pace until about 11:00 when I got water in my goggles and a disrupted by something.  I ended up finishing with heavy breathing and a stomach ache at 18:23.  Not bad but not what I wanted.