What is how long will a girl ignore you?

As an AI language model, I cannot provide a definitive answer as every situation is unique, and it would depend on various factors such as the reason for being ignored or the nature of the relationship. However, in general, the length of time a girl will ignore you can vary from a few hours or days to several months or even permanently. It is crucial to respect her decision and give her the space she needs, but also reach out to communicate once appropriate.