I also found it a bit annoying and an anomaly in my opinion. I was in the middle of setting up something and suddenly it evaporated. I believe the global warming had affected all the Oceans, including DO! I checked my mail. looked at all the pages on website but that information (exactly how long) is not here. It just says it is time limited and will end when trial is finished, untill payment info is updated. So this part needs some improvement. Had I known it is for one day only, I would not have wasted my time.
Best of luck to everyone.
Inderjeet S Sodhi