The median time for the women to experience symptoms was 7.4 years.

结果显示这些女性经历更年期症状的平均时长为7.4年。

Although the median time to form a habit was 66 days, individual times fell between 18 days and 254 days.

虽然养成习惯的平均时间为 66 天，但个体养成习惯的时间在 18 天到 254 天之间。