Five months until MIMS! In the meantime, some data porn for your enjoyment (click to enlarge):
The NYC Swim website has MIMS results as far back as 1915, but the modern version of MIMS as an annual marathon swim race began in 1982, when Drury Gallagher founded the Manhattan Island Swimming Association.
The chart above shows every MIMS finishing time from 1982-2010 (black dots), along with the slowest, fastest, and median time of each year (blue, green, & red lines, respectively). Only participants in the annual MIMS race are shown - no solo attempts (e.g., Shelley Taylor-Smith’s record swim of 5:45 in 1995).