How often should two separated lovers send messages to each other?

Hehe, send it every day. Send it when you have time. I said not only that, but also daily contact, such as chatting (network voice, video, etc. If you are not afraid of the phone bill, you can call. Moreover, in order not to let the sweetness drop, we should also ensure a certain meeting time, such as May Day, November Day, Chinese New Year, and winter vacation and summer vacation if we are students.