I agree that a good trader should do well irrespective of whether it's 30 days or 60 days. Nonetheless, even if we consider the average traders, given that most traders lose money in the long-run, it should be obvious that, so far probabilities are concerned, the odds of them having a profitable day would be greater than the odds of having a profitable week, the odds of having a profitable week would be greater than the odds of having a profitable month, & of course, the odds of being profitable over a 30 day period would be greater than the odds of being profitable over a 60 day period, & thereby, for most traders, a 30 Day Challenge would increase the odds of getting a refund.