While, it's not precisely what happened to me, I do think I can tell you why this happened to you! The days in the challenges count down from the amount you choose! So, if you choose three days, within one minute of saving, it will have counted down to 2 days and 59 minutes! At that point, and for the next 23 hours 59 minutes, it will say "about 2 days" for time remaining! In actuality, you will get the full 3 days, it just won't look like it! If you want it to say 3 days, you need to choose 4 days, when selecting the time! I hope this helps!