How does fermentation duration typically differ between red and white wines?

The differentiation in fermentation duration between red and white wines is primarily attributed to the desired extraction of tannins and color found in red wines. During red wine fermentation, the grape skins, which contain most of the pigments and tannins, are left in contact with the juice for a longer period. This extended contact allows for more thorough extraction of these components, which contribute to the wine's structure, flavor profile, and aging potential.

In contrast, white wines are typically fermented without the skins, resulting in a shorter fermentation duration. The focus for white wines is often on developing delicate aromas and maintaining freshness, which is better achieved through a more controlled and shorter fermentation process.

Thus, since red wines rely on the prolonged fermentation period to achieve the rich complexity and depth associated with them, the chosen answer accurately reflects the winemaking practices that differentiate these two categories of wine.