There is no fixed answer, because the amount of gifts depends on many factors, such as your relationship with new people, your financial situation and local customs.

Generally speaking, you can decide how much gift money to send according to your close relationship with the newlyweds, your financial situation and the local average gift money level. If you are close to the newlyweds, or the local customs are high, then you can choose to give a higher gift. On the other hand, if the relationship is far away or the economic situation is limited, you can choose to give a relatively low gift.

The customs in Zhoushan area are roughly the same as those in most parts of the country, and friends or relatives with general relationships generally send 200 ~ 1000 yuan. But this is not fixed, you can adjust it according to the specific situation. The most important thing is to express your blessing and respect to the newlyweds.