RAM now has an online conversion calculator. Here, you can convert your times from yards to meters, calculate how many yards you can swim for a 1 hour postal challenge, as well as calculate how long it would take to swim the 6,000 postal challenge. All you need to do is pick the conversion factor from the drop-down menu and enter your times. Please do check out the entry forms for the 5K/10K postal challenge .   . When Mary DeMilia swam the 5k postal challenge with her husband, it was fun (and that was coming from a sprinter!).