In my experience, sitting tight is not an option. You can actually avoid that max paper loss by taking some warranted action. Yes, iron condors and butterflies rely on reversion theory--that the market always rebounds back to its starting placing before it advances or declines. Well, if that happened every time, then everyone would be using these strategies. McMillan has suggested exiting the winning short option at some point (I like to use 75-80% of its value) and "wait" for the underlying to rebound so that the other short option can be exited with a profit. This is a pretty aggressive treatment, and of course, your profits will be maximized if the market behaves this way. Others like to "roll," using closer to the money shorts, for example. Here is the problem I see with an extended move that doesn't rebound--the positions do not stay delta neutral. Once the underlying reaches a certain point, the winning short options stop going down in value as quickly as the loser increases in value. So, what is the point in keeping that winning short option? There really isn't one--hence the rolling (to try to stay more delta neutral) or the exiting of the winner.