The need for oiling can range from one time per week to one time per month, depending on the humidity of where you live. There isn't a specific standard time that oiling is required. It depends on what type of oil you're using, what type of glove you have, and the overall humidity of the environment where you choose to store your glove. The best way to get it right is to read the instructions on the oil's label and determine how often you should oil it that way.