Hi Darren, a couple of years ago our air con unit in the living room leaked, always after a day of use. found that the drain from the unit goes down the wall and out under the sink unit into the sink trap, this was too low going into the trap so i had to re-route the hose. To test if you have a leaking air con pipe behind the wall take the hose off the trap and put it into a bucket and run your air con, i assume you were using your air con when you got the leak after two days, if the leak stops you may have a leaking pipe. Only a suggestion.