This verb tense describes a future, ongoing action that will occur before a specified future time.

The future perfect continuous progressive tense is a verb tense that can be used to refer to an action that will be continuing until a certain point of time in future. It expresses an action or event that will be progressing to a specific time in future.

For example:

• In the next few years, we will have been wearing masks and washing our hands more often than ever before.
• How long will she have been playing the piano when she graduates?