E-commerce platform pushes SMS to users. How often is it appropriate to push text messages?

There are activities that must be put off, such as one or two days ago or the same day. Usually it can be a week, half a month or a month. Mainly depends on the property that the commodity belongs to China. For example, consumables such as dog food should be pushed from time to time. A good SMS platform is shared here, and Xiamen Kalos can also be used as a backup channel.