the feeling of a person whose attention, concern, or curiosity is particularly engaged by something: She has a great interest in the poetry of Donne. something that concerns, involves, draws the attention of, or arouses the curiosity of a person: His interests are philosophy and chess.
Primary fermentation usually takes between three to seven days to complete. It goes by much more quickly than secondary fermentation because wine must is a much more fertile environment for the yeast. Sugar and oxygen levels are high during primary fermentation and there are plenty of nutrients.
An undesirable feature of such relatively low-temperature fermentations is the longer period required for completion (six to 10 weeks compared to one to four weeks at higher temperatures) and the tendency for the fermentation to stop while residual sugar remains.