Quote from RagedAlternate
If you meant every 72 hours that is what it should say. I have been and will continue to post every 3rd day.
Just to add my interpretation of this: If the rule was every 3rd day, then that is what I believe it would say. However, the rule states every 3 days, which you would therefore then add the days like you add the time: Don't include the hour you are on; rather, start on the next hour to begin. (Going from 4 to 5 o'clock would be 1 hour, not 2).