John Gottman's research reveals a stunning ability to predict the longevity of marriages. By analyzing just one hour of conversation between a couple, he can accurately forecast with 95 percent certainty whether they will remain married fifteen years into the future. This level of precision showcases the depth of his understanding of relationship dynamics.

Gottman's accuracy even holds true in shorter observations; after merely fifteen minutes of watching a couple interact, he maintains a success rate of around 90 percent. This indicates that subtle cues in communication can significantly indicate the potential for lasting marital success.