In some places, sister groups need to accompany the bride the day before the wedding and help her choose a wedding dress and arrange a wedding venue. On the wedding day, the sister group needs to help the couple to deal with temporary or unexpected situations, such as opening the car door for the bride, picking up the bride during the float parade and contacting the staff, serving plates and stopping drinks when the couple toasts. In other places, sister groups may only need to accompany the bride on the wedding day and leave after the wedding.
Generally speaking, the length of time a sister group needs to accompany the bride depends on the specific customs and circumstances. In the whole process, they need to obey the bride's arrangement, help her complete all the preparations for the wedding and accompany her until the end of the wedding.