The article estimates how long it takes for real exchange rates to correct themselves when they deviate from their normal levels. The researchers used a model that combines economic theory with real-world data to study this. They found that, on average, it takes about 2.8 years for exchange rates to return to their correct levels after going off track. This means that about 25% of the deviation is fixed within a year. Additionally, almost half of the countries studied have exchange rates that correct themselves in less than 2.5 years, which matches predictions from certain economic models.