I know there are set time frames. This happens when I turn my computer off and come back to it. I can see the helmets still have hours and sometimes days left in the challenge and then my progress goes back to nothing.
I agree with Monkey. I am also at the latest levels and to get 3 helmets by working hard to have them go away because I have to tend to my daily routine is just a huge pain. I hope the developers decide to change it back! The game is fun and challenging, and sometimes you just need some help. The helmets give you that edge…