Backlink drip feeding is the practice of progressively creating artificial links over time for a website instead of making a single massive backlink full blast. The goal of backlink drip feeding is to stay below the Google’s radar.
There is no rules about how many links per day have to be created according to drip feeding principles. Some software tools and services still create more than one thousand links per day, others a few hundred. With most elaborate "manual" link schemes, it can be a few per day.
With blasting tools, backlink blast are scheduled in a calendar.
An example of blast programming: