The duration of the second fermentation ( which is fermented in the bottle ) contributed significantly to improving the quality and taste of champagne a lot. The regulations are based on the duration of fermentation for Non Vintage Champagne must have time to marinate for at least 1 year. And Vintage Champagne is fermented three years at least.
During the champagne is fermented in the bottle. One important reaction called ' Yeast. Autolysis' reaction to this has contributed significantly to the development of taste and smell to be more complex. Champagne and a solid body than sparkling wine in general. Smell and taste, mainly The reaction from Yeast Autolysis to smell the biscuits, bread or toast.